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prof. Ing. Vítězslav Benda, CSc.

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A Note on Limits and Trends in PV Cells and Modules

  • DOI: 10.3390/app12073363
  • Link: https://doi.org/10.3390/app12073363
  • Department: Department of Electrotechnology
  • Annotation:
    The key components of photovoltaic (PV) systems are PV modules representing basic devices, which are able to operate in outdoor conditions for a long time. PV modules can be manufactured from different materials using different production technologies. The main criterion supporting or limiting the successful placement of specific technologies on the market is the price of electricity produced by PV systems. The levelized cost of energy (LCOE) method considers investment costs, operating costs, and the total energy produced during a PV system's service life. The influence of price, efficiency, and service life of PV modules on the LCOE (together with the availability of materials) sets limits for applicable technologies. Increasing the efficiency of the modules from 21% to 23% could lead to a reduction of the area-dependent part of the PV system costs by 8.7%. Extending the service life from 25 to 30 years could reduce the LCOE by about 10%. As shown in the work, wafer-based crystalline silicon technologies best meet these criteria due to their high efficiency, low costs, long service life, and the availability of materials at present. Technological innovations make it possible to increase the efficiency of the modules closer to the physical limits and to extend the service life of the modules.

Education in Photovoltaics as a part of the REPowerEU

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of 10th INTERNATIONAL WORKSHOP ON TEACHING IN PHOTOVOLTAICS. PRaha: České centrum Institution of Engineering and Technology, 2022. p. 7-11. ISBN 978-80-01-07014-7.
  • Year: 2022
  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaics has been recognised as a renewable energy technology having the potential to contribute significantly to future energy supply. The European Green Deal has added to the importance of photovoltaics as one of the most important component in the future energy mix, and the new REPowerEU programme further emphasizes its importance. To establish an infrastructure and to meet the requirements of the market, education and training are needed for specialists in this field. Different aspects of education in photovoltaics are discussed.

Innovation Drivers in Crystalline Silicon PV Module Technology

  • Department: Department of Electrotechnology
  • Annotation:
    Technological innovations make it possible to increase the efficiency of the PV modules closer to the physical limits and to extend the service life of the modules. This transition will depend on the extent to which savings in area-proportional costs outweigh the costs associated with producing modules of higher efficiency, and on overcoming certain material limits that may affect this development. At present, wafer-based crystalline silicon technologies best meet the criteria due to their high efficiency, low costs, long service life and low material constrains, and in the current production of photovoltaic energy they represent almost 95% of the total module production that this year probably overcame 200 GWp level in annual production. The influence of individual innovation drivers on the LCOE is discussed. Increasing the efficiency of the modules from 21% to 23% could lead to a reduction of the area-dependent part of the PV system costs by 8.7%. Extending the service life from 25 to 30 years could reduce the LCOE by about 10%.

International Workshop on Teaching in Photovoltaics IWTPV 2022

  • Department: Department of Electrotechnology
  • Annotation:
    The article reports on the international event International Workshop on Teaching in Photovoltaics IWTPV 2022 (Prague, 16-17 June 2022), whose goal was the exchange of experience in the field of education and training in the field of photovoltaics, which are one of the priorities of the REpowerEU project. The article discusses the EU goals in the field of photovoltaics and the specifics of education in this area.

Photovoltaics in the Czech Republic

  • Department: Department of Electrotechnology
  • Annotation:
    The article describes the development and problems of photovoltaics in the Czech Republic and in the world in the period 1990 - 2022 and discusses the requirements arising from the REPowerEU plan

Present trends in crystalline silicon photovoltaic cells and modules

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of 10th INTERNATIONAL WORKSHOP ON TEACHING IN PHOTOVOLTAICS. PRaha: České centrum Institution of Engineering and Technology, 2022. p. 41-45. ISBN 978-80-01-07014-7.
  • Year: 2022
  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaics (PV) is expected to play an important role in the future global energy system. Advances in technology have led to an impressive reduction in the price of photovoltaic modules and other parts of photovoltaic systems, so that the cost of electricity produced by photovoltaic systems has fallen close to the long-term cost of electricity in the grid. The key components are PV modules, which are basic devices that are capable of long-term operation in outdoor conditions. PV modules can be implemented from different materials with different production technologies. Innovative driving forces are module cost, module efficiency and module life. At present, wafer-based crystalline silicon technologies best meet the criteria due to their high efficiency, low costs, and long service life, and in the current production of photovoltaic energy they represent almost 95% of the total module production. The article discusses trends in crystalline silicon technologies

Quick Diagnostic Tool for Thin-Film Photovoltaic Power Plants Utilizing Dark Current Measurement

  • DOI: 10.1109/JPHOTOV.2022.3145096
  • Link: https://doi.org/10.1109/JPHOTOV.2022.3145096
  • Department: Department of Electrotechnology
  • Annotation:
    There exist many photovoltaic (PV) power plants which are based on thin-film technology. Unlike PV power plant with crystalline silicon technology, the diagnostic possibilities of thin-film PV modules are limited due to seasonal effects and problematic utilization of thermography. The main problem of degradation of these PV plants is the area degradation which affects even PV power plants with transformer inverters. Although there exist measurement methods based on I–V curve measurement, these methods require specific climatic conditions (clear sky, sufficient irradiance) and time. Here, we present the novel approach to diagnose thin-film modules affected with degradation which provides quick results with low-cost equipment.

The Service Life of the PV Systems and its Impact on Electricity Costs

  • Department: Department of Electrotechnology
  • Annotation:
    Using a simple approximation for LCOE , assuming only service life changes, service life extension reduces LCOE (eg, increasing service life from 10 to 11 years results in a relative reduction in LCOE of 8.26%, increasing life from 20 leads to a relative reduction in LCOE of 3.94% for 21 years). In terms of LCOE, the effect of extending the service life is comparable to the effect of increasing the PV modules efficiency

Current developments in the field of photovoltaics

  • Department: Department of Electrotechnology
  • Annotation:
    The article describes the current development in the field of photovoltaics from 2008 to the present in terms of the development of the average efficiency and price of photovoltaic modules and in terms of growth in installed capacity. It also deals with the growing share of photovoltaics in electricity generation

Diagnostics of PID Early Stage in PV Systems

  • DOI: 10.3390/en14082155
  • Link: https://doi.org/10.3390/en14082155
  • Department: Department of Electrotechnology
  • Annotation:
    Potential induced degradation (PID) is a serious threat for the photovoltaic (PV) industry. The risk of PID may increase with increasing operating voltage of PV systems. Although PID tests are currently standard tests, the expansion of floating PV power plants and installation in humid climates show that PID-free modules are still sensitive to this type of degradation. Therefore, a method that can detect PID in the initial phase before standard tests reveal it, is necessary to increase the reliability of PV systems and maintain their lifetime. One possible tool for revealing early-stage PID manifestations is impedance spectroscopy and I-V dark curves measurements. Both IS and dark current measurement methods are sensitive to cell shunt resistance (RSH), which is strongly influenced by PID before significant power loss and can act as an early stage PID detection mechanism. The paper describes the differences of the common P-type PV module parameters both during the degradation process and also during the regeneration process when diagnosed by conventional and IS and dark current measurement methods.

Present and future photovoltaic modules –Trends and limits

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: GLOBAL SUMMIT ON FUTURE OF MATERIALS SCIENCE AND RESEARCH. Vancouver: Peers Alley Media 1126 59 Ave East, V5X 1Y9 Vancouver BC, Canada, 2021.
  • Year: 2021
  • Department: Department of Electrotechnology
  • Annotation:
    Improvements in the module efficiency and service life demand a higher technology level that increase the production costs, but decrease the cost of other parts (BOS) of the system. The influence of efficiency, service life and costs on the technology of PV modules with regard to the costs of the entire PV system on LCOE is discussed.The presented analyses show that any PV module technology for future PV power generation should meet the criteria: efficiency higher than 14%, price below 0.4 USD/Wp, service life of more than 15 years. At the same time, it must ensure the availability of materials for annual production in excess of 500 GWp. Technologies that do not meet all the criteria would find only limited application in the market.

Photovoltaics, Including New Technologies (Thin Film) and a Discussion on Module Efficiency

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Future Energy Improved, Sustainable and Clean Options for our Planet. Cambridge: Elsevier, 2020. p. 375-412. ISBN 978-0-08-102886-5.
  • Year: 2020
  • DOI: 10.1016/B978-0-08-102886-5.00018-9
  • Link: https://doi.org/10.1016/B978-0-08-102886-5.00018-9
  • Department: Department of Electrotechnology
  • Annotation:
    This chapter provides basic information about the current state of photovoltaics (PVs). It deals with the energy of sunlight falling on the surface of the Earth, with the interaction with materials and with the possibility of direct conversion of solar radiation into electrical energy. In brief, the principle of PV cells and modules is explained. Furthermore, the most important technologies of production of both crystalline silicon and thin-film modules and modules are discussed. The chapter also deals with the problems of PV systems, both autonomous and systems connected to the grid. It deals with basic types of inverters and BOS components and energy storage. Finally, the price of electricity produced by current PV systems is discussed and compared with the price of energy produced by other types of sources.

PV cells and modules – State of the art, limits and trends

  • DOI: 10.1016/j.heliyon.2020.e05666
  • Link: https://doi.org/10.1016/j.heliyon.2020.e05666
  • Department: Department of Electrotechnology
  • Annotation:
    PV modules can be manufactured using different materials by different fabrication technologies. The main criteria supporting or limiting a successful placement of particular technologies on the market is the cost of electricity produced by PV systems. The Levelized Cost of Energy (LCOE) method takes into account the investment cost, the operating costs, and the total energy produced during the system service life. The influence of price, efficiency and service life of PV modules on LCOE (together with the availability of materials) sets limits for applicable technologies.

Impact of Defective Modules on the Characteristics of a Large-Scale Grid-Connected PV Power Plant

  • DOI: 10.4229/EUPVSEC20192019-5CV.4.42
  • Link: https://doi.org/10.4229/EUPVSEC20192019-5CV.4.42
  • Department: Department of Electrotechnology
  • Annotation:
    The effect of the connection of different, shaded or damaged module on the performance of the whole string or the photovoltaic (PV) panel connected to a single inverter is very often discussed. Although there exist the means for protecting the PV system against negative influence of connecting PV modules with different parameters into one system (diodes, power optimizers), the real impact is not examined anymore. The simulation tools presume the connection of the same module type with same parameters and the differences are discussed only theoretically. The simulations performed in the SPICE program rather indicate that with less damage, one different module should not have a significant effect on the power drop, even in the theoretical case that no bypass diode is included in the string. The results of simulation as well as the measurement on the real system with modules with different parameters are presented in this work.

Main development trends in photovoltaics

  • Department: Department of Electrotechnology
  • Annotation:
    Over the past 20 years, advances in technology have led to an impressive reduction in the cost of photovoltaic modules and other components, increasing efficiency and a significant improvement in the reliability and yield of the photovoltaic system, which resulted in a subsequent drop in the price of electricity produced. This is associated with a rapid increase in the installed capacity of photovoltaic power plants. The article summarizes the current development and discusses trends.

PV cells and modules - state of art, trends and limits

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Program & Abstracts, 2019 EMN JEJU MEETING. Institute of Fundamental and Frontier Sciences, 2019. p. 29-30.
  • Year: 2019
  • Department: Department of Electrotechnology
  • Annotation:
    Publication summarizes present state of the art in the field of pohotovoltaic technology and discusses its future trends and limits.

Chapter 8 Photovoltaics: The Basics

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: A comprehensive guide to solar energy systems with special focus on photovoltaic systems. London: Elsevier Applied Science, 2018. p. 151-179. ISBN 978-0-12-811479-7.
  • Year: 2018

chapter 9 Crystalline Silicon Solar Cell and Module Technology

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: A comprehensive guide to solar energy systems with special focus on photovoltaic systems. London: Elsevier Applied Science, 2018. p. 181-213. ISBN 978-0-12-811479-7.
  • Year: 2018
  • DOI: 10.1016/B978-0-12-811479-7.00009-9
  • Link: https://doi.org/10.1016/B978-0-12-811479-7.00009-9
  • Department: Department of Electrotechnology
  • Annotation:
    Since 1970, crystalline silicon (c-Si) has been the most important material for PV cell and module fabrication and today more than 90% of all PV modules are made from c-Si. Despite 4 decades of research and manufacturing, scientists and engineers are still finding new ways to improve the performance of Si wafer-based PVs and at the same time new ways of reducing the cost. The present state of art and future trends in silicon wafer-based technology will be discussed in this chapter.

Education for PV Terawatt Era

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of 9th International Workshop on Teaching in Photovoltaics. Praha: Czech Technical University in Prague, 2018. p. 7-9. ISBN 978-80-01-06402-3.
  • Year: 2018
  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaics has a potential to contribute significantly to future energy energy supply. To establish infrastructure, education and training are needed for specialists in the field

IMPEDANCE SPECTROSCOPY OF CDTE PV MODULES – COMPARATIVE STUDY

  • Department: Department of Electrotechnology
  • Annotation:
    One of interesting technology of photovoltaic modules which can be used within an industrial scale is CdTe. These modules are indeed problematic due to Cd content, but still represent interesting alternative to standard crystalline photovoltaic modules, mainly thanks to their significantly higher energy yield. Often discussed problems connected with thin-film modules are their stability, variability of production generations and also the degradation. One of possible method which can reveal early state of degradation connected with shunts is described in this article.

New Curricula for Teaching PV on the Bachelor Level at the CTU in Prague, FEE

  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, Faculty of Electrical Engineering, courses dealing with PV system technology form a part of both the bachelor and master study programme in Electrical Engineering and Information Technology. The courses were modified to fit better to present trends in photovoltaics. Synopsis of individual courses (both lectures and exercises) are discussed in details.

PV Plants for Installation in Tropical Climates of Congo Basin

  • Department: Department of Electrotechnology
  • Annotation:
    The paper is about highlighting the problems related to the application of PV systems in countries near the equatorial line in Africa, where a high demand on electricity is. Many of these countries are situated near to the Congo Basin. In such regions, the average temperature is 26ºC throughout the year, however, due to its constant humidity there is almost a permanent presence of clouds and/or a higher level of diffusion irradiance in comparison to the direct irradiance. Fast moving clouds also cause spatial variability in solar irradiance, thus leading to mismatch of PV modules actual performance within one array

NOTE ON COLE-COLE DIAGRAMS OF PHOTOVOLTAIC MODULES EVALUATION

  • Department: Department of Electrotechnology
  • Annotation:
    There exist many method used for photovoltaic (PV) modules and systems diagnostics. One of the less conventional is impedance analysis of PV cells or modules which gives additional information about measured cell, module respectively. Due to high amount of possible sources of uncertainties and low repeatability when performed under samples irradiation, the evaluation of obtained results is relatively complicated. In this paper, the comparison of conventional methods and impedance analysis and its possible evaluation and limits are presented.

Photovoltaic cells and modules towards Terawatt Era

  • Department: Department of Electrotechnology
  • Annotation:
    Present developments in the three generations of photovoltaic modules are discussed along with the criteria for the selection of appropriate photovoltaic module manufacturing technologies.

The Effect of Non-Uniform Temperature Distribution in PV Cells and Their Interconnections

  • Authors: Wolf, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of 33rd European Photovoltaic Solar Energy Conference and Exhibition. Munich: WIP - Renewable Energies, 2017. p. 1647-1649. ISSN 2196-0992. ISBN 3-936338-47-7.
  • Year: 2017
  • Department: Department of Electrotechnology
  • Annotation:
    The paper is focused on effects caused by non-uniform temperature distribution in photovoltaic (PV) arrays. The influence of non-uniform operating conditions on electrical parameters has been studied on both individual solar cells and on their parallel interconnection. To determine the temperature effects, simulations, as well as measurements on crystalline silicon PV cells, has been carried out. The results can be used to give an estimation on how the temperature would affect the overall electrical yield. This can be useful in designing a PV system where the non-uniform temperature can occur in an effective way.

IMPEDANCE SPECTROSCOPY AND ITS POSSIBLE USE FOR DEFFECTS DETECTION

  • Department: Department of Electrotechnology
  • Annotation:
    A common problem to be solved during the operation of photovoltaic (PV) power plants is early detection of PV modules defects. Usual methods are based on both measurement of electric parameters and visualization of possible defects (thermography). The common electric measurement usually doesn’t show the initial damage like less serious cracks inside the module. For these purposes is necessary to use some advanced visualization method like electroluminescence. But this requires either special equipment or the dark chamber. In this text is presented a new approach to revealing the hidden defects using impedance spectroscopy. The results of measurement are presented as well as comparison between the individual methods.

New curricula of undergraduate and graduate courses on Photovoltaics at the Czech Technical University in Prague, Faculty of Electrical Engineering

  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, Faculty of Electrical Engineering, courses dealing with PV system technology form a part of both the bachelor and master study programme in Electrical Engineering and Information Technology. A course on Photovoltaic Systems has been included in the master study programme Intelligent Buildings. This paper provides detail information about the courses.

PHOTOVOLTAIC CELLS AND MODULES – STATE OF THE ARTS AND TRENDS

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Renewable Energy Sources 2016 - Proceeding. Bratislava: Slovak University of Technology, 2016. pp. 8-13. ISBN 978-80-89402-82-3.
  • Year: 2016
  • Department: Department of Electrotechnology
  • Annotation:
    Trends following from present technology levels are discussed taking into account also other parts of PV systems that influence the cost of electrical energy produced. The wafer based crystalline silicon technologies have the role of workhorse of present PV power generation, representing nearly 90% of total module production. Further technology improvements have to be implemented without significantly increasing costs per unit, despite the necessarily more complex manufacturing processes involved. Very promising may be tandems of crystalline silicon and thin film cells. Durability may be a limiting factor of this technology due to a strong dependence of produced electricity cost on the module service time.

Photovoltaic cells and modules towards terawatt era

  • Department: Department of Electrotechnology
  • Annotation:
    Progress in PV technology over the past years is evident from the lower costs, the rising efficiency and the great improvements in system reliability and yield. Cumulative installed power yearly growths were on an average more than 40% in the period from 2000 to 2013, and in 2014, the global cumulative PV power installed has reached 178 GWp. The level 0.5 TWp could be reached before 2020. The production processes in the solar industry still have great potential for optimization both wafer based and thin film technologies. Trends following from present technology levels are discussed taking into account also other parts of photovoltaic systems that influence the cost of electrical energy produced. Present developments in the three generations of PV modules are discussed along with criteria for the selection of appropriate photovoltaic module manufacturing technology. The wafer based crystalline silicon technologies have the role of workhorse of present PV power generation, representing nearly 90% of total module production. Further technology improvements have to be implemented without significantly increasing costs per unit, despite the necessarily more complex manufacturing processes involved. Very promising may be tandems of crystalline silicon and thin film cells. Durability may be a limiting factor of this technology due to a dependence of produced electricity cost on the module service time.

Present Photovoltaics State of Art and Education

  • Department: Department of Electrotechnology
  • Annotation:
    Education and training are very important for preparing present and future in the field. General types of courses and their main feature are mentioned to promote discussion of specialists about an optimisation course curricula and exchange of experiences with present forms of education in the field of photovoltaics, in order to establish an infrastructure and to meet the requirements of the market.

Study of Shunt Distributions in Thin Film Multijunction Solar Cells

  • Department: Department of Electrotechnology
  • Annotation:
    The thin film technology of photovoltaic modules is perspective from the low cost point of view and with the respect of special, for example flexible modules. However, within a range of allowed temperature it is hard to prepare a high quality semiconductor material. On the other hand the technology can easily adopt a complex multi-layer structure, particularly a tandem structure, in which the cell with the narrower band gap is covered by the one with the wider band gap. For the characteristics and diagnostics of tandem cells it is necessary to distinguish the contributions of the component sub-cells to the total performance. One of the tasks is the determination of the component contributions to the total voltage, which is strongly influenced by the amount and spatial distribution of shunts in each sub-cell. We show that the total voltage is not a simple sum of component voltages. The experimental results are presented in this paper.

The present developlment in the field of CdS/CdTe thin-film modules

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: FF2016 - Sborník přednášek z duální konference Praha. Plzeň: Česká fotovoltaická asociace, 2016. pp. 80-83. ISBN 978-80-906281-3-7.
  • Year: 2016
  • Department: Department of Electrotechnology
  • Annotation:
    The paper discusses present progress in the field of CdTe photovoltaic modules from viewpoint of both technological progress and present state of the art of photovoltaic industry. The increase in efficiency of CdTe PV modules will result in an increased demand for advanced applications, especially in areas with a high ambient temperature. Due to limited sources of Te, the dominated position of crystalline silicon in PV applications will remain in future.

Thin-film Modules Degradation

  • Department: Department of Electrotechnology
  • Annotation:
    A disadvantage of thin film technology, whose production requires less material, is higher susceptibility to degradation of materials used. This degradation obviously results in a performance decrease. Some materials are more susceptible to degradation, some less, like the physical principles of degradation of some materials are known, others not. One of the main reasons for the growing popularity of thin film technology PV modules is an effort to implement photovoltaic modules into buildings or objects of daily use where mechanical flexibility and ease of manufacture are the key parameters. Re-installing growth, thin-film cells, however, also means the necessity to study degradation, which can occur in some cases and, ultimately, the diagnostics, which will allow to detect a possible defect in a timely manner.

A Simple Method of Evaluating Thermograms of Photovoltaic Modules

  • Department: Department of Electrotechnology
  • Annotation:
    A common problem to be solved during the operation of photovoltaic (PV) power plants is early detection of faults in PV systems. For this purpose was developed many diagnostic methods which can be applied directly at the PV system without the need of its disassembling. A very popular tool is especially the analysis of temperature distribution on the PV module - thermography, which is also a good tool for checking electrical connections (fire hazard). The problem is that there is virtually no quantification of obtained thermograms. This work provides guidance on how to reliably perform such quantification without the need of any other special device using.

Method of Reducing Losses of PV Power Plants Based on CIGS Technology with Transformerless Inverters

  • Department: Department of Electrotechnology
  • Annotation:
    The problematics of thin film PV modules degradation connected with transformerless inverters operation is relatively well known. But, there exists also the problem connected with immediate power loss, caused also by high-frequency currents, which can occur when the used inverter doesn’t have sufficient filter. In the case of new installations, these problems are solved and no more occur, but there is a large couple of already existing PV systems, where changing of all inverters is not cost effective or worse, restricted by law (loss of license and advantageous feed-in tariff). Such problems can be partially solved using additional filter with suitable characteristic. In this paper, the description and verification of such a filter is presented.

Photovoltaic cells and modules towards terawatt era

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: EMN CANCUN MEETING 2015 PROGRAM & ABSTRACT. Fayetteville, Arkansas: Open-Access House of Science and Technology, 2015.
  • Year: 2015
  • Department: Department of Electrotechnology
  • Annotation:
    Impressive progress in PV technology over the past years is evident from the lower costs, the rising efficiency and the great improvements in system reliability and yield has been demonstrated. Further progress can be achieved by new processes, new tools based on this processes, new materials and new designs of products has been discussed.

Photovoltaic Modules with High Efficiency

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Fotovoltaické fórum a Energetická konference - sborník přednášek. Plzeň: Česká fotovoltaická asociace, 2015. pp. 14-17. ISBN 978-80-906281-1-3.
  • Year: 2015
  • Department: Department of Electrotechnology
  • Annotation:
    There are discussed construction and technological solutions that can be used for realizing PV modules with the efficiency close to basis thermodynamic limits in the case of both one material and tandem PV cells. The economical considerations connected with using different solutions are also discussed.

Photovoltaic Systems - State of the Art and Trend

  • Department: Department of Electrotechnology
  • Annotation:
    New features for grid stabilization and optimization of self-consumption storage unit included in the PV system are also discussed.

Photovoltaics towards terawatts – progress in photovoltaic cells and modules

  • DOI: 10.1049/iet-pel.2015.0102
  • Link: https://doi.org/10.1049/iet-pel.2015.0102
  • Department: Department of Electrotechnology
  • Annotation:
    Material and solar cell and module fabrication technology seem to be the most important in the field of photovoltaics, because the progress expectations in photovoltaic applications. This review is to give information important for understanding basic problems of physics, construction and manufacturing photovoltaic cells and modules and their connection with present market developments. Trends following from present technology levels are discussed. Silicon is and will remain the dominant photovoltaic material at minimum till 2020.

PID effect on photovoltaic power plants

  • Department: Department of Electrotechnology
  • Annotation:
    In recent years, the owners of large solar parks pay his attention to the term Potential Induced Degradation (PID). It is one of the most important influences that cause considerable loss of performance of the entire photovoltaic (PV) system. The article describes the types of PID and possible mechanisms of their formation. Particularly the effect on the crystaliline silicon modules and possible solution are described.

Present development in the field of photovoltaic cells and modules

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Workshop on Photonics: Fundamentals & Applications. Izmir: ICTP - Euroasian Centre for Advanced Research, 2015. pp. 22.
  • Year: 2015
  • Department: Department of Electrotechnology
  • Annotation:
    Further technology improverments have to be implemented without significantly increasing costs per unit, despite the necessarily more complex electrical energy are disscused from the viewpoint of module cost, module efficiency and module service time.

PV modules efficiency in the Czech Republic

  • Department: Department of Electrotechnology
  • Annotation:
    The efficiency of conventional PV modules is usually considered constant over the entire irradiance range. This can result in erroneous evaluation of the real efficiency of PV modules, where the values of efficiency under standard testing conditions (STC) are used for calculating. According to the real yield of systems, it shows that would be advantageous for the operator to know the efficiency not only for STC irradiance value but also weighted efficiency as in the case of inverters, where are taking into account local conditions through so called European (optionally California) efficiency.

ANNEALING OF POLYCRYSTALLINE THIN FILM SILICON SOLAR CELLS IN WATER VAPOUR AT SUB-ATMOSPHERIC PRESSURES

  • DOI: 10.14311/AP.2014.54.0341
  • Link: https://doi.org/10.14311/AP.2014.54.0341
  • Department: Department of Electrotechnology
  • Annotation:
    Thin film polycrystalline silicon (poly-Si) solar cells were annealed in water vapour at pressures below atmospheric pressure. PN junction of the sample was contacted by measuring probes directly in the pressure chamber filled with steam during passivation. Suns-VOC method and a Lock-in detector were used to monitor an effect of water vapour to VOC of the solar cell during whole passivation process (in-situ). Tested temperature of the sample (55°C – 110°C) was constant during the procedure. Open-circuit voltage of a solar cell at these temperatures is lower than at room temperature. Nevertheless, voltage response of the solar cell to the light flash used during Suns-VOC measurements was good observa

Crystalline silicon cells and modules in present photovoltaics

  • Department: Department of Electrotechnology
  • Annotation:
    The workhorse of present photovoltaics is crystalline silicon technology. Basic principles of photovoltaic cell physics and technology have been demonstrated on fabrication of crystalline silicon cells and modules, also new prospective technologies. Differences between technologies are discussed and present domination of crystalline silicon technology is explained. The aim is to give information important for understanding basic problems of physics, construction and manufacturing photovoltaic cells and modules. © 2014 Kavala Institute of Technology.

Education in Photovoltaics at the Czech Technical University in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the 7th International Workshop on Teaching in Photovoltaics IWTPV'14. Praha: České vysoké učení technické v Praze, 2014. pp. 18-22. ISBN 978-80-01-05477-2.
  • Year: 2014
  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, Faculty of Electrical Engineering, courses dealing with PV system technology form a part of both the bachelor and master study programme in Electrical Engineering and Information Technology. A course on Photovoltaic Systems has been included in the master study programme Intelligent Buildings. This paper provides detail information about the courses

From Basic Knowledge to Diagnostics

  • Department: Department of Electrotechnology
  • Annotation:
    There is described the educational system of Photovoltaics at FEE CTU in Prague in the article. The connection with praxis and interfaculty study programm Inteligent Buildings is also discussed.

Photovoltaics towards Terrawatts –Progress in Photovoltaic Cells and Modules

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ISPS'14 Proceedings. Praha: České vysoké učení technické v Praze, 2014. pp. 117-126. ISBN 978-80-01-05555-7.
  • Year: 2014
  • Department: Department of Electrotechnology
  • Annotation:
    After 30 year’s development, photovoltaics has been recognized as a renewable energy technology that has the potential to contribute significantly to future energy supply. Material and solar cell and module fabrication technology seem to be the most important in the field of photovoltaics, because the progress expectations in photovoltaic applications necessitate a decrease of photovoltaic cell (module) cost on the level of more than 30% of today’s one. Basic principles of photovoltaic cell physics and technology have been demonstrated on fabrication of crystalline silicon cells and modules, thin film cells and modules, and also new prospective technologies.

Present photovoltaics and Education

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the 7th International Workshop on Teaching in Photovoltaics IWTPV'14. Praha: České vysoké učení technické v Praze, 2014. pp. 5-8. ISBN 978-80-01-05477-2.
  • Year: 2014
  • Department: Department of Electrotechnology
  • Annotation:
    The paper summarises present development in the field of photovoltaics and discusses the potential of photovoltaics to contribute significantly to future energy supply. Education and training are very important for preparing present and future in the field. General types of courses and their main feature are mentioned to promote discussion of specialists about an optimisation course curricula and exchange of experiences with present forms of education in the field of photovoltaics, in order to establish an infrastructure and to meet the requirements of the market.

Students' projects at the Department of Electrotechnology CTU FEE Prague

Thermography in photovoltaics

  • Department: Department of Electrotechnology
  • Annotation:
    The article summarizes the basic properties of the PV modules from the viewpoint of thermal manifestations of defects. It outlines a new evaluation method of taken thermograms.

Using Measurement of AC Parameters for CIGS PV Modules Degradation Studying

  • DOI: 10.1109/MIEL.2014.6842150
  • Link: https://doi.org/10.1109/MIEL.2014.6842150
  • Department: Department of Electrotechnology
  • Annotation:
    In the paper is described Time Domain Reflectometry method which can be used for differentiation of PV modules with same static plate values. Different AC parameters can cause dissimilar behavior in alternating fields leading to premature degradation.

Diagnostics of Photovoltaic Modules by Using AC Measurement Methods

  • Department: Department of Electrotechnology
  • Annotation:
    The presentation summarizes the basic methods used for the diagnostics of PV modules. Attention is paid to the analysis of alternate methods and achieved unique results in the measurement of PV modules.

Diagnostics of photovoltaic power plants operation

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: The Innovetion Week on R.E.S., P.V. systems engineering and the other renewable energy systems and the entrepreneurship spirit. Patras: TEI Patras, 2013. ISBN 978-960-7801-24-1.
  • Year: 2013
  • Department: Department of Electrotechnology
  • Annotation:
    This article deals with solving problems of reliable function of photovoltaic power stations. Issues concerning monitoring photovoltaic power plant operation, failure identification and repairing are discussed.

Diagnostics of PV Modules Using Time Domain Reflectometry

  • Department: Department of Electrotechnology
  • Annotation:
    In the article are described possibilities of using TDR method for distinction of various generation of the same PV module type.

Economic and Technological Trends in Photovoltaics

  • Department: Department of Electrotechnology
  • Annotation:
    The article describes the current and future prospects of the photovoltaic installation in the Czech Republic and Europe.

Experience from PV system performence including comparison of on-roof and façade systems. (Case study on BIPV systems.)

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: The Innovetion Week on R.E.S., P.V. systems engineering and the other renewable energy systems and the entrepreneurship spirit. Patras: TEI Patras, 2013. ISBN 978-960-7801-24-1.
  • Year: 2013
  • Department: Department of Electrotechnology
  • Annotation:
    3 kW photovoltaic system was installed as a demonstration system and serves also for the needs of education and for a study of operating services in Prague. This paper presents same data about system performance in the period 2002-2012.

Identification of PV solar cells and modules parameters by combining statistical and analytical methods

  • DOI: 10.1016/j.solener.2013.03.018
  • Link: https://doi.org/10.1016/j.solener.2013.03.018
  • Department: Department of Electrotechnology
  • Annotation:
    In this paper, we discuss the proposed method of identifying the parameters of photovoltaic cells/modules with the help of curve fitting by using both analytical and statistical methods. Increased computing power in recent years enables us to find fast and accurate solutions to non-linear equations and allows a wide range of use of this method. Evaluation was done on computed I-V curves with chosen model parameters and also on samples of mono-crystalline silicon cells. In the latter case the samples were measured with a Pasan cell tester IIc under variable conditions, model parameters were calculated and the model was compared with measured data

Optimization of a photovoltaic system used for water heating

  • Department: Department of Electrotechnology
  • Annotation:
    This article describes a photovoltaic generator used for water heating and compares it with the well known solar thermal system. Photovoltaic modules can be connected to the load both directly or via a regulator that tracks the maximal power point of the modules. Measurements and simulations in meteorological conditions of Czech Republic were done to set the energy loss for a system without the regulator. It was found that without the regulator the system can deliver maximally 77 % of energy. To achieve high efficiency of the system, maximal power point tracking has to be used.

Photovoltaic cell and module physics and technology

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: The Innovetion Week on R.E.S., P.V. systems engineering and the other renewable energy systems and the entrepreneurship spirit. Patras: TEI Patras, 2013. ISBN 978-960-7801-24-1.
  • Year: 2013
  • Department: Department of Electrotechnology
  • Annotation:
    The aim of this article is to give information important for understanding problems of device physics and construction. Photovoltaic cell and modules and their characteristics are discussed in details, cell construction and technology emphasizing both efficiency and low production cost are presented.

Photovoltaic Cell and Modules Theory and Technology (Chapter IV)

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Renewable Energy Systems: Theory, Innovations and Intelligent Applications. Hauppauge NY: Nova Science Publisher, Inc., 2013. p. 287-345. Renewable Energy: Research, Development and Policies. ISBN 978-1-62417-741-5.
  • Year: 2013
  • Department: Department of Electrotechnology
  • Annotation:
    Basic principles of photovoltaic cell physics and construction have been discussed in details. Applications of basic principles of photovoltaic cell and module physics and technology have been demonstrated on fabrication of both crystalline silicon cells and modules and also thin film cells and modules.

A Note on Irradiance Dependence of Photivoltaic Cell and Module Parameters

  • Department: Department of Electrotechnology
  • Annotation:
    This paper provides an analysis of the irradiance influence on photovoltaic cell efficiency in dependence on the cell construction, using the standard equivalent circuit describing solar cell. The influence of the series resistance is discussed in details and results of simulations are completed with experimental result obtained by measuring crystalline silicon solar cells and in broad intervals of irradiance and temperature and measuring different types of PV modules in a broad interval of irradiance

Advanced Course of Photovoltaics - SUNS-Voc Method

  • Authors: Pikna, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 6th International Workshop on Teaching in Photovoltaics. Praha: Nakladatelství ČVUT, 2012. pp. 91-93. ISBN 978-80-01-05022-4.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    A Suns-Voc measuring system built on the basis of cooperation between CTU and AS is presented in this article. This device is able to measure current-voltage (IV) characteristic of a solar cell remarkable way and is going to be included into the Advanced Course of Photovoltaics. Explanation of Suns-Voc method follows.

Basic Course of Photovoltaics Especially for Erasmus Students

  • Authors: Pikna, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 6th International Workshop on Teaching in Photovoltaics. Praha: Nakladatelství ČVUT, 2012. pp. 83-86. ISBN 978-80-01-05022-4.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    Comprehensible and progressive education program including basic aspects of sun energy acquisition is proposed in this article. Photovoltaics taught at the Czech Technical University (CTU) is devided into a basic and an advanced course. The article gives overview of a practical part - laboratories - of the Basic Course of Photovoltaics offered especially to Erasmus students. Basic principles of photovoltaics are often explained to students without any previous knowledge of solar energetics. Therefore, education of solar energy should begin from a background already known from some other electrotechnical subjects.

Courses on Photovoltaics at the Czech Technical University in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 6th International Workshop on Teaching in Photovoltaics. Praha: Nakladatelství ČVUT, 2012. pp. 25-28. ISBN 978-80-01-05022-4.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, courses dealing with PV system technology form a part of both the bachelor and master study programme in Electrical Engineering and Information Technology. A course on Photovoltaic Systems has been included in the master study programme Intelligent Buildings. This paper provides information about the courses

Diagnostics of Photovoltaic Modules

  • Department: Department of Electrotechnology
  • Annotation:
    The article summarizes the diagnostic methods used in photovoltaics. Special emphasis is placed on explaining the difficulties related to their incorrect application and possible consequences.

Diagnostics of photovoltaic power plant operation

  • Department: Department of Electrotechnology
  • Annotation:
    This article deals with solving guidelines for trouble-free operation. Issues concerning monitoring solar power plant operation, failure identification and repairing are discussed.

Energy from the Sun

  • Authors: prof. Ing. Vítězslav Benda, CSc., Matuška, T.
  • Publication: Obnovitelné zdroje energie. Praha: Profi Press, 2012. p. 82-113. ISBN 978-80-86726-48-9.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    The Chapter deals with the solar energy conversion into electrical energy using photovoltaic systems and into heat using solar thermal systems.

Experience from PV system performance including comparison of on-roof and facade

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Innovation Week on Renewable Energy Systems. Patras: TEI Patras, 2012. ISBN 978-960-7801-23-4.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    3 kW photovoltaic system was installed as a demonstration system and serves also for the needs of education and for a study of operating services in Prague. This paper presents same data about system performance in the period 2002-2011.

Laboratory Exercises in Teaching Solar Systems at the Department of Electrotechnology CTU FEE Prague

  • Department: Department of Electrotechnology
  • Annotation:
    There are almost 2 GW installed capacity of photovoltaic sources in Czech Republic. This situation requires more specialists in the field of photovoltaics, diagnostics especially. At the Department of Electrotechnology are many subjects focused on this problematic. With the growth of photovoltaics were these subjects enhanced by other diagnostic method and grater allowance of lessons allowed coming deeper into problematic. This article contains description of laboratory exercises and equipment used in the education.

Photovoltaic cells and module physics and technology

  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaic cell and their characteristics are discussed in details, cell construction and technology emphasizing both efficiency and low production cost are presented. The aim of this article is to give information important for understanding important problems of device physics and construction.

Photovoltaic Cells and Modules - State of Art and Future Trends

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the Sixth Global Conference on Power Control and Optimization. New York: American Institute of Physics, 2012. pp. 6-14. AIP Conference Proceedings. ISSN 0094-243X. ISBN 978-0-7354-1113-5.
  • Year: 2012
  • DOI: 10.1063/1.4768962
  • Link: https://doi.org/10.1063/1.4768962
  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaic cell and their characteristics are discussed in details, cell construction and technology emphasizing both efficiency and low production cost are presented. The aim of this article is to give information important for understanding important problems of device physics and construction.

Photovoltaic Modules Diagnostics

  • Department: Department of Electrotechnology
  • Annotation:
    The article summarizes the basic methods of diagnostics of PV modules. In addition to describing the consequences at an incorrect procedure for their application are listed. It is also one part devoted to performance guarantee and its relationship to modules aging .

Photovoltaic System for Water Heating Purposes

  • Department: Department of Electrotechnology
  • Annotation:
    This article focuses on using the photovoltaic generator as an energy source for a resistance load. Photovoltaic modules can be connected to the load both directly or via a regulator that tracks the maximal power point of the modules. It was found that a direct connection of PV generator and load can deliver maximally 77% of annual energy in meterological conditions of Czech Republic when compared with a system using the regulator.

Photovoltaic System With Resistance Load for Water Heating Purposes

  • Authors: Wolf, P., Kuřík, O., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Nekonvenční zdroje elektrické energie. Praha: Česká elektrotechnická společnost, 2012. pp. 44-50. ISBN 978-80-02-02372-2.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    This article focuses on using the photovoltaic generator as an energy source for a resistance load. Photovoltaic modules can be connected to the load both directly or via a regulator that tracks the maximal power point of the modules. It was found that a direct connection of PV generator and load can deliver maximally 77% of annual energy in meterological conditions of Czech Republic when compared with a system using the regulator.

Present Photovoltaics and Education

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 6th International Workshop on Teaching in Photovoltaics. Praha: Nakladatelství ČVUT, 2012. pp. 5-8. ISBN 978-80-01-05022-4.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    The paper summarises present development in the field of photovoltaics and discusses present and future needs of education and training specialists in the field. General types of courses and their main feature are mentioned to promote discussion of specialists about an optimal course curricula and exchange of experiences with present forms of education in the field of photovoltaics.

SEMI Europe Brussels Forum

  • Department: Department of Electrotechnology
  • Annotation:
    The paper gives information about problems discussed at the SEMI Europe Brussel Forum in April 2012 and recommendations for Industrial Policy for Europe

State of art and future trends in photovoltaic cells and modules

  • Department: Department of Electrotechnology
  • Annotation:
    Basic principles of photovoltaic cell physics and technology have been demonstrated on fabrication of crystalline silicon cells and modules, thin film cells and modules, and also new prospective technologies. The aim is to give information important for understanding basic problems of physics, construction and manufacturing photovoltaic cells and modules.

Water Vapor Passivation of Poly-Si Thin Film Solar Cells

  • Authors: Pikna, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: XII. Tradiční workshop doktorandů a mladých vědeckých pracovníků. Ostrava: Vysoká škola báňská, 2012. pp. 55-58. ISBN 978-80-248-2664-6.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    Samples prepared by CSG Solar AG were annealed in water vapour - structure of these solar cells will be presented - innovative approach for back-side metallization of pn junction was used. Surface of samples seem etched after annealing in water vapour, but no significant improvement of open-circuit voltage Voc was observed. Amorphous silicon deposited on a quartz substrate by solid phase crystallization was crystallized to prepare a poly-Si layer. Further investigation is focused on preparation of a complete pin poly-Si solar cell structure. Current-voltage characterisations were measured before and after annealing in water vapour by Suns-Voc method modified to investigate thin film solar cells without metalization.

Water Vapor Passivation of Poly-Si Thin Film Solar Cells

  • Authors: Pikna, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: POSTER 2012 - 16th International Student Conference on Electrical Engineering. Praha: Czech Technical University in Prague, 2012. pp. 55-58. ISBN 978-80-01-05043-9.
  • Year: 2012
  • Department: Department of Electrotechnology
  • Annotation:
    Water vapor passivation would be a promising treatment for thin film solar cells. A consistent plan for investigation of passivation procedure and also some heretofore reached results are proposed in this article. Two approaches are presented - water vapor passivation of poly-Si samples produced by CSG Solar AG and of our own-made samples. Surface of the CSG Solar's samples seemed etched after the vapour treatment (3hours, 3 bars, 145°C), but no significant change in Voc of solar cells was observed. Novel approach for contacting the bottom layer of pn junction for measurement of current-voltage (IV) characteristics by Suns-Voc method will be presented.

Determination of recombination centers in c-Si solar cells from dark I-V characteristics

  • DOI: 10.1109/ISSE.2011.6053935
  • Link: https://doi.org/10.1109/ISSE.2011.6053935
  • Department: Department of Electrotechnology
  • Annotation:
    For photovoltaic cells efficiency is the quality of material key ingredient. Impurities in this material create recombination centers which cut down the effective carrier charge lifetime. The method of dark current measurement, which is described in paper, can be used for dominant impurity determination.

Diagnostics of Photovoltaic Systems

  • Department: Department of Electrotechnology
  • Annotation:
    Some results in the field of the photovoltaic systems diagnostics have been discussed in the paper. There were three areas of interest solved in this work. The first was analysis of photovoltaic power plant operation and methods of localization possible failure. The second was diagnostics of silicon solar cells using measurement of dark I-V characteristics. The third area was analysis of photovoltaic modules characterization with the aim to determine the effects of the most predominant failures that can appear by outdoor conditions influence and ageing of materials.

Electrical parameters of c-Si and CIS photovoltaic cells in dependence on temperature and irradiance

  • Department: Department of Electrotechnology
  • Annotation:
    For photovoltaic applications, the knowledge about system behaviour in real operating conditions is desirable. Presented paper describes the dependences of all important parameters of crystalline silicon (c-Si) cell and CIS photovoltaic mini-module on both temperature and irradiance obtained using cell tester Pasan IIc.

PHOTOVOLTAIC CELLS AND MODULES - STATE OF ART AND FUTURE TRENDS

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Fifth Global Conference on Power Control and Optimization. Kuala Lumpur: National Library of Malaysia, 2011. ISBN 978-983-44483-4-9.
  • Year: 2011
  • Department: Department of Electrotechnology
  • Annotation:
    The aim is to give information important for understanding basic problems of physics, construction and manufacturing photovoltaic cells and modules. Application of basic principles of photovoltaic cell physics and technology has been demonstrated on fabrication of crystalline silicon cells and modules, thin film cells and modules, and also new prospective technologies.

Power Semiconductors - State of Art and Future Trends

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the fourth global conference on power control and optimization. New York: American Institute of Physics, 2011. pp. 16-24. ISSN 0094-243X. ISBN 978-0-7354-0893-7.
  • Year: 2011
  • DOI: 10.1063/1.3592437
  • Link: https://doi.org/10.1063/1.3592437
  • Department: Department of Electrotechnology
  • Annotation:
    Advances in power semiconductor technology have improved the efficiency, size, weight and cost of power electronic systems. At present, IGCTs, IGBTs, and MOSFETs represent modern switching devices. Power integrated circuits (PIC) have been developed for the use of power converters for portable, automotive and aerospace applications. For advanced applications, new materials (SiC and GaN) have been introduced. This paper reviews the state of these devices and elaborates on their potentials in terms of higher voltages, higher power density, and better switching performance.

Power Semiconductors - State of the Art And Future Trends

  • Department: Department of Electrotechnology
  • Annotation:
    This paper reviews the state of power semiconductor devices and elaborates on their potentials in terms of higher voltages, higher power density, and better switching performance.

SEMI Europe Brussels Forum

  • Department: Department of Electrotechnology
  • Annotation:
    In the paper, information about the SEMI Europe Brussels Forum, taking place in Brussels on 24 May 2011, are provided. There were discussed problems concerning future development of semiconductor industry in Europe, especially in the field of Key Enabling Technologies

Some Aspects of Education in Photovoltaics

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Lecture Notes in Management Science - 2011 International Conference on Physical Education and Society Management. Singapore: Singapore Management and Sports Science Institute, PTE, LTD, 2011. pp. 97-100. ISSN 2251-3051. ISBN 978-981-08-9834-2.
  • Year: 2011
  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaics has been recognised as a renewable energy technology that has the potential to contribute significantly to future energy supply. At the Czech Technical University in Prague, a course in Systems for Solar Energy Exploitation, dealing with PV system technology (28 hours of lectures, 28 hours of exercises) forms a part of the bachelor study programme in Electrical Engineering and Information Technology. A course of similar length on Photovoltaic Systems has been included in the master study programme in Intelligent Buildings. This paper provides information about the course structure.

A Note on Parameters of Photovoltaic Cells in Dependence on Irradiance and Temperature

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Proceeding MedPower 2010. Nicosia: IET Cyprus LN, 2010. pp. 206-209. ISBN 9781617823114.
  • Year: 2010
  • DOI: 10.1049/cp.2010.0896
  • Link: https://doi.org/10.1049/cp.2010.0896
  • Department: Department of Electrotechnology
  • Annotation:
    This paper provides an analysis of the irradiance influence on photovoltaic cell efficiency in dependence on the cell construction, using the standard equivalent circuit describing solar cell.The influence of the series resistance is discussed in details and results of simulations are completed with experimental result.

A Quest for Effective Education and Training in the Field of Photovoltaic

  • Department: Department of Electrotechnology
  • Annotation:
    The paper summarises present development in the field of photovoltaics and discusses present and future needs of education and training specialists in the field. General types of courses and their main feature are mentioned to promote discussion of specialists about an optimisation course curricula and exchange of experiences with present forms of education in the field of photovoltaics.

Determination of Recombination Centres in c-Si Solar Cells from Dark I-V Characteristics

  • Authors: Salinger, J., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: 27th International Conference on Microelectronics Proceedings. Niš: University of Nis, 2010. pp. 149-151. ISBN 978-1-4244-7198-0.
  • Year: 2010
  • Department: Department of Electrotechnology
  • Annotation:
    In this paper emphasis is placed on a simple and fast method for obtaining parameters of traps in solar cel structures using measurements of dark characteristics. Preliminary results are introduced, together with the difficulties and limits of this method.

Diagnostics of photovoltaic power plant operating

  • DOI: 10.1049/cp.2010.0929
  • Link: https://doi.org/10.1049/cp.2010.0929
  • Department: Department of Electrotechnology
  • Annotation:
    This article deals with solving problems of reliable function of photovoltaic power stations. Issues concerning monitoring photovoltaic power plant are real and ongoing. Guidelines for troublefree PV plant operation are discusssed in the paper. operation.

Experience with laboratory exercises in a course on photovoltaic systems at the Czech Technical University in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: IWTPV'10 Proceedings. Praha: Nakladatelství ČVUT, 2010. pp. 89-93. ISBN 978-80-01-04532-9.
  • Year: 2010
  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, a course in Photovoltaic Systems, dealing with PV system technology (28 hours of lectures, 28 hours of exercises) forms a part of the master study programme in Electrical Engineering and Information Technology. This paper provides information about the course structure and laboratory exercises oriented towards photovoltaic system applications.

Optimal Design of Photovoltaic Power Plants in Relation to System Cost-Effectiveness

  • Authors: Wolf, P., Smejkalová, I., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Global Green Techies Forum &Exhibition 2010. Amman: Jordanian Renewable Energy Society, 2010. pp. 16.
  • Year: 2010
  • Department: Department of Electrotechnology
  • Annotation:
    The paper focuses on finding the optimal ratio between the power of photovoltaic (PV) modules and power of inverter. Based on simulations and experience with real systems, it has been found that the payback time of a system with oversized PV generator compared to the inverter power can be reduced and the system become more cost-effective.

Performance of Photovoltaic on-grid system FV-2003A

  • Department: Department of Electrotechnology
  • Annotation:
    At the CTU FEE was built in the year 2001 an on-grid connected 3 kWp photovoltaic system that is used not only for demonstration but also for study system performance under conditions of Prague agglomeration. This paper presents same data about system performance in the period 2002-2009

Photovoltaic cell and module technology

  • Department: Department of Electrotechnology
  • Annotation:
    At present, crystalline silicon photovoltaic cells represent about 90% of total photovoltaic cell production. Therefore, application of basic principles of photovoltaic cell physics and technology has been demonstrated on fabrication of crystalline silicon cells and modules. In future, very important will be also thin film cells and modules. Principles of thin film fabrication technology are discussed in details, too.

Photovoltaic Cells - History and Current Trends of Development

  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaics is one of very quickly developing fields, the installed power is increasing more than 30% per year. From the viewpoint of trends, photovoltaics becomes more and more important.

Photovoltaic Workplace at CVUT-FEL

  • Department: Department of Electrotechnology
  • Annotation:
    The text deals with the newly established and existing workplace for the diagnostics of photovoltaic cells, and modules respectively, located at the Department of Electrotechnology FEL CVUT. There are described the properties of existing equipment - the professional cell tester PASAN IIc, LBIV and LBIC method and dark current measurement; and characteristics of the new module tester PASAN Sun Simulator IIIc to measure under the Standard Testing Conditions and low light intensity and high voltage tester HiPot Sefelec SXS560.

Physics and construction of photovoltaic cells and modules

  • Department: Department of Electrotechnology
  • Annotation:
    Photovoltaic cell and their characteristics are discussed in details, cell construction and technology emphasizing both efficiency and low production cost are presented. The aim of this article is to give information important for understanding important problems of device physics and construction.

Power Semiconductors - State of Art and Future Trends

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceeding of Fourth Global Conference on Power Control and Optimization. Kuala Lumpur: National Library of Malaysia, 2010. ISBN 978-983-44483-3-2.
  • Year: 2010
  • Department: Department of Electrotechnology
  • Annotation:
    Advances in power semiconductor technology have improved the efficiency, size, weight and cost of power electronic systems. At present, IGCTs, IGBTs, and MOSFETs represent modern switching devices. Power integrated circuits (PIC) have been developed for the use of power converters for portable, automotive and aerospace applications. For advanced applications, new materials (SiC and GaN) have been introduced. This paper reviews the state of these devices and elaborates on their potentials in terms of higher voltages, higher power density, and better switching performance.

Sizing the Inverter and PV Panels in Terms of Jear-Round Efficiency of the System

  • Authors: Wolf, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 31. Nekonvenční zdroje elektrické energie. Brno: VUT v Brně, FEI, 2010. pp. 42-46. ISBN 978-80-02-02243-5.
  • Year: 2010
  • Department: Department of Electrotechnology
  • Annotation:
    This article focused on the power ratio between the solar inverter and solar generator in a typical photovoltaic system. Based on simulation it shows the optimal ratio to reach the shortest payback time of initial system cost.

A Note on Non-Uniform Recombination in Large Area Silicon Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: The Physics of Semiconductor Devices: Technical Digest. New Delhi: EXCEL INDIA PUBLISHERS, 2009. pp. 18-22. ISBN 978-93-80043-60-9.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    This paper discusses the influence of carrier lifetime inhomogeneous distribution on device characteristics. There is also a discussion of monitoring methods measuring carrier lifetime distribution both in starting single crystal material and in device structures after high-temperature processes and technological tools for structure homogenisation.

Detection of PV Cell Parameters Based on I-V Characteristics

  • Authors: Wolf, P., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 30. Nekonvenční zdroje elektrické energie. Brno: VUT v Brně, 2009. pp. 47-49. 1.. ISBN 978-80-02-02164-3.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    This article focuses on finding the parameters of commonly used models for PV cell and their serial and parallel interconnections. It discusses the commonly used methods, methods specified by norms and their pros and cons. It also shows a pure numerical approach- curve fitting using the chosen electrical model.

Effect of Non-Uniform Temperature Distribution in the Photovoltaic Array on Eefficiency of Photovoltaic Systems

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z., Wolf, P., Staněk, K.
  • Publication: Proceedings ISES Solar World Congress 2009. Freiburg: International Solar Energy Society, 2009. pp. 901-909. ISBN 978-1-920017-42-2.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    This paper focuses on issues concerning the efficiency drop of photovoltaic systems with non-uniform temperature distribution in the photovoltaic array

Electrical Parameters of the Solar Cells Soldered Joints in Comparison to Electrically Conductive Adhesive Joints

  • DOI: 10.4229/24thEUPVSEC2009-4AV.3.83
  • Link: https://doi.org/10.4229/24thEUPVSEC2009-4AV.3.83
  • Department: Department of Electrotechnology
  • Annotation:
    This article deals with possibility to use electrically conductive adhesive joints instead of soldered joints in the solar cells electrode system. One of the advantages of the using adhesive joints instead of soldered joints is less mechanical destruction of solar cells during the production. Like a next advantage we should notice on ecological point of view. Therefore in this article will be compared three different types of electrically conductive adhesives against solder. We prepared specific samples for four-point probe method measurement of the electrical resistance between conductive layer and tinned copper ribbon. The samples were temperature stressed and the change of the electrical resistance between the connection of the conductive layer and tinned copper ribbon was observed.

Experience from PV system performance (including comparison of on-roof and façade systems in Prague)

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: E-Technologies on Renewable Energy Systems (R.E.S): Teaching & Learning. Patras: TEI Patras, 2009. ISBN 978-960-7801-21-0.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    Experience from PV system performance in Prague (including comparison of on-roof and façade PV systems installed at the CTU in Prague)

Parameters of photovoltaic cells in dependence on irradiance

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Elektrotechnologie 2009. Praha: České vysoké učení technické v Praze, 2009. ISBN 978-80-01-04379-0.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    In this work, the results of measurements of I-V characteristics of crystalline silicon cells and a CIS mini-module in a broad range of temperature and irradiance, using cell tester Pasan IIc, are presented.

Photovoltaic Cell Physics and Construction

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: E-Technologies on Renewable Energy Systems (R.E.S): Teaching & Learning. Patras: TEI Patras, 2009. ISBN 978-960-7801-21-0.
  • Year: 2009
  • Department: Department of Electrotechnology
  • Annotation:
    Physics of photovoltaic cells, parameters of photovoltaic cells, construction of photovoltaic cells, technology of photovoltaic cells and modules, both crystalline Si and thin films.

Present Trends in the Field of Photovoltaic Cells and Modules

  • Department: Department of Electrotechnology
  • Annotation:
    This article makes a surway on present development in the field of the most important technologies of solar cells and modules.

A Note on Solar Cell Diagnostics Using LBIC and LBIV Methods

  • Authors: Salinger, J., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Proceedings 26th International Conference on Microelectronics MIEL 2008. Piscataway: IEEE, 2008. pp. 217-220. ISBN 978-1-4244-1881-7.
  • Year: 2008
  • DOI: 10.1109/ICMEL.2008.4559262
  • Link: https://doi.org/10.1109/ICMEL.2008.4559262
  • Department: Department of Electrotechnology
  • Annotation:
    LBIC and LBIV methods are widely used for diagnosing solar cell homogeneity. These two methods are compared theoretically, and also by looking at the maps of the examined solar cells. Attention is paid to the working point of the LBIC method, which applies not only for modified LBIV devices but for all measurements of short circuit current.

A Quest for Optimal Education and Training in Field of Photovoltaics

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 4th International Workshop on Teaching in Photovoltaics. Praha: České vysoké učení technické v Praze, 2008. pp. 5-7. ISBN 978-80-01-04047-8.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    Education and training are needed for specialists in this field in odher to establish an infrasrtucture and to meet the requirements of the market. The workshop opening address summarises present development in the field of photovoltaics and discusses present and future needs of education and training specialists in the field.

Education in photovoltaics at Czech Technical University in Prague, Faculty of Electrical Engineering

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z., Wolf, P.
  • Publication: Třetí Česká fotovoltaická konference. Rožnov pod Radhoštěm: Czech RE Agency, o.p.s., 2008. pp. 25-27. ISBN 978-80-254-3528-1.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    In the paper are given information about education in photovoltaics at the CTU in Prague, Faculty of Electrical Engineering. In details is discussed sylabus of the course on "Photovoltaics systems".

Education in the Field of Photovoltaics at the Czech Technical University in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: EUROSUN 2008. Lisabon: SPES - Sociedade Portuguesa de Energia Solar, 2008. pp. 627-628. ISBN 978-972-95854-7-0.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    At the Czech Technical University in Prague, a course in Photovoltaic Systems, dealing with PV system technology (28 hours of lectures, 28 hours of exercises) forms a part of the master study programme in Electrical Engineering and Information Technology. This paper provides information about the course structure.

Laboratory Excercises on Photovoltaics at CTU in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: EUROSUN 2008. Lisabon: SPES - Sociedade Portuguesa de Energia Solar, 2008. pp. 625-626. ISBN 978-972-95854-7-0.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    This paper provides information about the course structure and laboratory exercises oriented towards photovoltaic system applications

Laboratory Exercises in a Course on Photovoltaic Systems at the Czech Technical University in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: 4th International Workshop on Teaching in Photovoltaics. Praha: České vysoké učení technické v Praze, 2008. pp. 91-94. ISBN 978-80-01-04047-8.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about laboratory exercises developed for a course on photovoltaic systems in the bachelor level of the study.

Monitoring of carrier lifetime distribution in high power semiconductor device technology

  • DOI: 10.1016/j.mejo.2007.11.015
  • Link: https://doi.org/10.1016/j.mejo.2007.11.015
  • Department: Department of Electrotechnology
  • Annotation:
    Non-uniform distribution of carrier lifetime over the area of power bipolar semiconductor devices results in a non-uniform distribution of on-state current density and switching loses. Consequently, it results in non-uniform temperature distribution which can negatively influence the device reliability. Several methods can be used for measuring carrier lifetime distribution both in starting single crystal material and in device structures after high-temperature processes. Advantages and disadvantages of individual methods and an optimum area of applications are discussed in this paper. This paper is mostly oriented on a possibility to use LBIC method for measuring carrier lifetime distribution in the bulk of high voltage large area devices, especially N+NPP+ diode structures.

Optimal Resolution of LBIV/LBIC Methods for Diagnostics of Solar Cell Homogeneity

  • Authors: Salinger, J., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Proceedings 26th International Conference on Microelectronics MIEL 2008. Piscataway: IEEE, 2008. p. 251-253. ISBN 978-1-4244-1881-7.
  • Year: 2008

Parameters of Photovoltaic CIS Cells in Dependence on Irradiance and Temperature

  • Authors: Macháček, Z., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 23rd European Photovoltaic Solar Energy Conference. Munich: WIP - Renewable Energies, 2008. pp. 2610-2612. ISBN 3-936338-24-8.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    Presented paper describes the dependences of all important parameters of CIS photovoltaic mini-module on both temperature and irradiance obtained using cell tester Pasan IIc.

Performance of Photovoltaic on-grid system FV-2003A

  • Department: Department of Electrotechnology
  • Annotation:
    At the CTU FEE was built 3 kWp system that is used both for demonstration and study system performance under conditions of Prague agglomeration. This paper presents same data about system performance in the period 2002-2008

Photovoltaic cells from crystalline silicon - present trends

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Třetí Česká fotovoltaická konference. Rožnov pod Radhoštěm: Czech RE Agency, o.p.s., 2008. pp. 20-24. ISBN 978-80-254-3528-1.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    The paper deals with construction and technology development of crystalline silicon photovoltaic cells. It describes present trends from the viewpoint of minimising cost of electricity produced by photovoltaic systems.

Physics, construction and technology of photovoltaic solar cells

  • Department: Department of Electrotechnology
  • Annotation:
    The aim of this article is to give information important for understanding important problems of device physics and technology.

Possibilities of Blended Learning in Teaching Photovoltaics

  • Authors: Jirsa, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 4th International Workshop on Teaching in Photovoltaics. Praha: České vysoké učení technické v Praze, 2008. pp. 125-127. ISBN 978-80-01-04047-8.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    The article aims to show one of the possible ways to improve a learning process in photovoltaic at our department.

Power semiconductor devices and integrated circuits

The effect of surface temperature distribution in PV cells on the overall power generation

  • Authors: Wolf, P., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Med Power 2008. Thessaloniki: Aristotle University of Thessaloniki, 2008. ISBN 978-960-98540-0-9.
  • Year: 2008
  • Department: Department of Electrotechnology
  • Annotation:
    This paper is focused on the issues concerning the effect of temperature distribution in PV cells on the overall power generation. In real applications, the temperature may be not homogenously distributed, there are temperature differences among the cells and even within the cells. The differences of the I−V characteristics negatively affect the system efficiency. To show this influence the resulting I−V curve was modeled and measurements on two parallel connected cells and a non-uniformly heated cell were made.

A Note on Solar Cell Diagnostics Using LBIC and LBIV Methods

  • Authors: Salinger, J., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Proceedings of the International Scientific Conference FMNS-2007. Blagoevgrad: South-West University, 2007. pp. 1-3. ISBN 978-954-680-537-9.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    For diagnostics of cell homogeneity, LBIC and LBIV methods are widely used. This paper deals with comparing two solar cell diagnostic methods via both the qualitative and quantitative analyses.

Basics of Solar Cell Physics and Construction

  • Department: Department of Electrotechnology
  • Annotation:
    Important features of significant materials for photovoltaics are mentioned and explained. Solar cell characteristics are discussed in details, solar cell construction and technology emphasizing both efficiency and low production cost are presented. The aim of this article is to give information important for understanding present problems of device physics and technology.

Carrier Lifetime Control in Power Semiconductor Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the XIV International Workshop on the Physics of Semiconductor Devices IWPSD 2007. Piscataway: IEEE, 2007. pp. 755-761. ISBN 978-1-4244-1727-8.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    The paper surveys the present technology of carrier lifetime control in power semiconductor devices by controlling recombination centre types and concentration. The correlation of lifetime with device properties such as on-state voltage drop, off-state leakage current and switching times of bipolar devices has been elucidated. Various techniques for preserving or reducing lifetime during semiconductor device fabrication are presented. Advantages, problems and some limits of individual techniques are discussed.

Education in the field of photovoltaics in Czech Republic

  • Department: Department of Electrotechnology
  • Annotation:
    In the Czech Republic, education in photovoltaics is provided at several levels. For primary and secondary schools, the Sun into Schools programme received state support from 2000 until 2006. Small on-grid connected PV demonstration systems were built at several hundred schools, and basic information was provided in the physics curriculum. Teacher education formed a part of this project. Specialists are prepared at university level. At the Czech Technical University in Prague, a course in Photovoltaic Systems, dealing with PV system technology (28 hours of lectures, 28 hours of exercises) forms a part of the master study programme in Electrical Engineering and Information Technology. A course of similar length on Photovoltaic Systems has been included in the master study programme in Intelligent Buildings. This course is deals with practical applications in energy-efficient buildings.

Electrical parameters of C-SI photovoltaic cells in dependence on temperature and irradiance

  • Authors: Macháček, Z., prof. Ing. Vítězslav Benda, CSc., Bařinka, R.
  • Publication: Proceedings of the International Scientific Conference FMNS-2007. Blagoevgrad: South-West University, 2007. pp. 24-28. ISBN 978-954-680-537-9.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    Presented paper describes the dependences of all important parameters of silicon photovoltaic cells on both temperature and irradiance obtained using cell tester Pasan IIc.

Materials for Photovoltaic-Thermal Hybrid Collector

  • Authors: Wolf, P., Macháček, Z., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: MICROTHERM 2007. Lodz: Technical University of Lodz, 2007. pp. 81-84. ISBN 978-83-60660-17-1.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    This text is discussed about technical problem with thermal connection between the PV cell and absorber plate.

Non-Uniform Temperature Distribution on a Photovoltaic Field under Real Operating Conditions

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z., Staněk, K.
  • Publication: ANZSES. Alice Springs: Australian and New Zealand Solar Energy Society - ANZSES, 2007.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    This paper focuses on issues concerning the efficiency drop of photovoltaic systems with increasing temperature, namely the temperature of each single solar cell and the temperature of the whole photovoltaic field. The temperature distribution on the photovoltaic field was measured using contactless pyrometer and thermal imaging camera on PV systems installed at the CTU, i.e. on the open-rack PV arrays and on the back ventilated facade PV array. The situation at the facade was simulated for the case of two vertical parallel plates with applied uniform heat flux where the temperature difference between the PV modules and the air in the ventilated gap remains constant along the height. Results of simulation are compared with experimental data.

Parameters of photovoltaic cells in dependence on irradiance and temperature

  • Department: Department of Electrotechnology
  • Annotation:
    Presented paper describes the dependences of all impertant parameters of silicon photovoltaic cells on both temperature and irradiance obtained using cell tester Pasan IIc.

Performance of Photovoltaic on-grid system FV-2003A

  • Department: Department of Electrotechnology
  • Annotation:
    At the CTU FEE was built a 3 kWp on-grid system that is used not only for demonstration but also for study system performance under conditions of Prague agglomeration. This paper presents same data about system performance in the period 2002-2007

Power Semiconductors (Editorial)

  • Department: Department of Electrotechnology
  • Annotation:
    The most progressive trends in the field of power semiconductor devices are recapitulated. On this background, the best 11 papers from the conference ISPS´06 (Pargue, 2006) have been presented this Special Issue as a selection represented curret research in the field.

Solar cell and module fabrication technology

  • Department: Department of Electrotechnology
  • Annotation:
    Application of basic principles of solar cell physics and technology has been demonstrated on fabrication of crystalline silicon solar cells. In future, very important will be also thin film cells. Principles of thin film fabrication technology are discussed in details, too.

Temperature Distribution on Photovoltaic Field in Real Condition

  • Authors: Macháček, Z., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: International Conference Thermal Problems in Electronics. Lodz: Technical University of Lodz, 2007. pp. 123-128. ISBN 978-83-60660-17-1.
  • Year: 2007
  • Department: Department of Electrotechnology
  • Annotation:
    Since the year 2001, a 3 kW on-grid photovoltaic system is installed on the rooftop of the Faculty of Electrical Engineering,, CTU in Prague. This system is being used not only for demonstration purposes, but also for the research of the operating conditions of such a system in Prague.

The Temperature Influence on the Interconnection Resistance between Conducitve Layer and Tinned Copper Ribbon

  • Department: Department of Electrotechnology
  • Annotation:
    This article deals with temperature influence on the interconnection resistance between conductive layer and tinned copper ribbon, which is an important parameter for the efficiency of the solar cells.

A Note on Diagnostics of Homogeneity of the Recombination Rate in Large Area Silicon Solar Cells Using Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: 21st European Photovoltaic Solar Energy Conference. Munich: WIP - Renewable Energies, 2006. pp. 1508-1511. ISBN 3-936338-20-5.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    This paper deals with the possibility of checking the recombination rate distribution in the bulk of the solar cell structure over the area of power (large-area) solar cells from measured values of both short circuit current JSC (LBIC - Light Beam Initiated Current) and open circuit voltage VOC (LBIV - Light Beam Initiated Voltage) using local irradiation by monochromatic light of different wavelengths. The influence of the wavelength of the incident light applied on the method resolution are discussed here.

A Note on Non-Uniform Distribution of the Carrier Lifetime in Large-Area Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ICSICT - 2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings. Piscataway: IEEE, 2006. pp. 1113-1116. ISBN 1-4244-0160-7.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    In the paper, the influence of carrier lifetime inhomogeneous distribution on device characteristics is discussed. Further, monitoring methods measuring carrier lifetime distribution both in starting single crystal material and in device structures after high-temperature processes and technological tools for the structure homogenisation are also discussed.

A Quest for Optimal Education and Training in the Field of Photovoltaics

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 3rd International Workshop on Teaching in Photovoltaics. Praha: Ediční středisko ČVUT, 2006. pp. 5-7. ISBN 80-01-03467-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    The paper summarises present development in the field of photovoltaics and discusses present and future needs of education and training specialists in the field. General types of courses and their main feature are mentioned to promote discussion of specialists about an optimisation course curricula and exchange of experiences with present forms of education in the field of photovoltaics.

Basics of Solar Cell Physics

  • Department: Department of Electrotechnology
  • Annotation:
    In the field of photovoltaics, material and solar cell fabrication technology seem be the most important, because the progress expectations in photovoltaic applications necessitate a decrease of solar cell (or module) cost on the level of 20% of today's one. On the other hand, detail physics of all kinds of prospective materials (including organics) and fabrication technologies exceeds limits given for the course and might be a subject of a course in graduate study of future specialists. Nevertheless, important features of significant materials should be mentioned and explained.

Crystalline Sillicon Solar Cells - Basic Technology of the Present

  • Department: Department of Electrotechnology
  • Annotation:
    Present development of photovoltaics is based on crystalline silicon cell technology. This represents more than 90% of present production and will dominate at minimum till 2010

Diagnostic of the N+ Large Homogeneity in Large Area Silicon Solar Cells Using Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z., Salinger, J.
  • Publication: 21st European Photovoltaic Solar Energy Conference. Munich: WIP - Renewable Energies, 2006. pp. 1512-1514. ISBN 3-936338-20-5.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    This paper deals with the possibility of checking the recombination rate in the individual layers of a solar cell from measurements of both short circuit current ISC and open circuit voltage VOC under conditions of local illumination by monochromatic light of a suitable wavelength (LBIC -Light Beam Induced Current, LBIV - Light Beam Induced Voltage).

Diagnostics of Homogeneity of Individual Layers of Large-Area Silicon Solar Cells Using Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z., Salinger, J.
  • Publication: 25th International Conference on Microelectronic. Niš: University of Nis, 2006. pp. 285-288. ISBN 1-4244-0116-X.
  • Year: 2006
  • DOI: 10.1109/ICMEL.2006.1650948
  • Link: https://doi.org/10.1109/ICMEL.2006.1650948
  • Department: Department of Electrotechnology
  • Annotation:
    This paper deals with the possibility of checking the recombination rate distribution over the area of power (large-area) solar cells from measured values of open circuit voltage using local irradiation by monochromatic light of diferent wavelengths. This method allows to check homogeneity of both carrier lifetime distribution in bulk of the cell and donor concentration distribution in the N+ layer.

Experience of Operations Photovoltaic Systems FV 2003A in Faculty of Electroengineering CTU in Prague

  • Department: Department of Electrotechnology
  • Annotation:
    Experience with Operating Demonstrational Photovoltaic System 3 kW on the Faculty of Electrical Engineering, CTU, Prague. This system was installed as a demonstrational system and serves also for the needs of education and for a study of operating services in Prague. This paper presents some data about system performance.

Experience with Operating Demonstrational Photovoltaic System FVS 2003A on the Faculty of Electrical Engineering, CTU, Prague

  • Authors: Macháček, Z., prof. Ing. Vítězslav Benda, CSc., Salinger, J.
  • Publication: 3rd International Workshop on Teaching in Photovoltaics. Praha: Ediční středisko ČVUT, 2006. pp. 115-118. ISBN 80-01-03467-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    Experience with Operating Demonstrational Photovoltaic System FVS 2003A on the Faculty of Electrical Engineering, CTU, Prague. This system was installed as a demonstrational system and serves also for the needs of education and for a study of operating services in Prague. This paper presents some data about system performance in the period 2002-2005.

ICSICT-2006 Shanghai

  • Department: Department of Electrotechnology
  • Annotation:
    Information about ICSICT Conference (International Conference on Solid-State and Integrated Circiuit Technology) taking place in Shanghai, 23-26 October, 2006. Information about a technical visit to one Technological Park in Shanghai.

Monitoring of Carrier Lifetime Distribution in Technology of High Power Semiconductor Devices

  • Authors: Kožíšek, J., Macháček, Z., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ISPS 06 Proceedings. Praha: Ediční středisko ČVUT, 2006. pp. 227-232. ISSN 1751-858X. ISBN 80-01-03524-7.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    Non-uniform distribution of carrier lifetime over the area of power bipolar semiconductor devices results in a non-uniform distribution of on-state current density and switching loses. The paper describes a simple method for determining the carrier lifetime distribution in structures of power diodes.

OCVD Carrier Lifetime in P+NN+ Diode Structures With Axial Carrier Lifetime Gradient

  • Department: Department of Electrotechnology
  • Annotation:
    The paper deals with OCVD Carrier Lifetime in P+NN+ diode structures with axial carrier lifetime gradient. Theoretically and experimentally is evaluated influence of carrier lifetime gradient on voltage courses during OCVD measurement and on the resulting carrier lifetime.

Power semiconductors

  • Department: Department of Electrotechnology
  • Annotation:
    Power semiconductor devices in present technology and future trends in papers selected for the Special issue from papers presented at the ISPS'04 Conference.

Solar Cell Construction

  • Department: Department of Electrotechnology
  • Annotation:
    The aim of this article is to give information important for understanding important problems of device physics, construction and technology. At present, crystalline silicon solar cells represent about 82% of solar cell production. Therefore, application of basic principles of solar cell physics and solar cell construction has been demonstrated on crystalline silicon solar cells. The basic principles of thin film cells construction are discussed, too.

Solar cell fabrication technology

  • Department: Department of Electrotechnology
  • Annotation:
    In the field of photovoltaics, material and solar cell fabrication technology seem be the most important, because the progress expectations in photovoltaic applications necessitate a decrease of solar cell (or module) cost on the level of 5% per year. The aim of this article is to give information important for understanding basic problems of device fabrication technology.

Teaching of the Photovoltaics at CTU FEE in the Context CR and EU

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 2. Česká fotovoltaická konference. Brno: VUT v Brně, FEI, 2006. pp. 191-193. ISBN 80-239-7361-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    The paper deals with education in the field of photovoltaics at CTU Prague in period 1986-2006 and further needs with respect to present development

The Effects of Lattice Imperfections on the Electrical Properties of Solar Cells

  • Authors: prof. Ing. Vítězslav Benda, CSc., Salinger, J., Macháček, Z.
  • Publication: 3rd International Workshop on Teaching in Photovoltaics. Praha: Ediční středisko ČVUT, 2006. pp. 109-113. ISBN 80-01-03467-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    The grade of a solar cell depends mainly on quality of starting material. During the production of this material many impurities are left in the bulk material and form a defect levels in the band-gap, which act as a generation-recombination centers or charge carrier traps. In this paper emphasis is placed on simply and fast method of obtaining these parameters, namely the measurement of dark characteristics.

The Extraction of the Deep Energy Level Parameters in the Band Gap of the Sillicon Solar Cells

  • Authors: Salinger, J., prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: 2. Česká fotovoltaická konference. Brno: VUT v Brně, FEI, 2006. pp. 89-91. ISBN 80-239-7361-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    A simple method for extraction of the deep energy level parameters in the band gap of the crystalline sillicon solar cells has been described. The method is based on the temperature dependence of dark I-V characteristics of solar cells.

The Influence of Different Operating Conditions on the Photovoltaic System FV 2003A on Faculty of Electrical Engineering on CTU in Prague

  • Department: Department of Electrotechnology
  • Annotation:
    This paper presented experience with Operating Demonstrational Photovoltaic System 3 kW on the Faculty of Electrical Engineering, CTU, Prague. This system was installed as a demonstrational system and serves also for the needs of education and for a study of operating services in Prague. This paper presents some data about system performance.

The Influence of the PV Field Operational Temperature on the Efficiency of the Photovoltaic System FVS 2003A

  • Authors: Macháček, Z., Salinger, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 2. Česká fotovoltaická konference. Brno: VUT v Brně, FEI, 2006. pp. 173-177. ISBN 80-239-7361-4.
  • Year: 2006
  • Department: Department of Electrotechnology
  • Annotation:
    In year 2001 an on-grid photovoltaic system was installed and is being used not only for demonstration but also for studying operational conditions in Prague. Analysis of measured date show the influence of the PV field operating temperature on the system efficiency.

The quest for optimum construction and technology of power semiconductor devices

20 Years of Photovoltaics on CTU-FEE

  • Department: Department of Electrotechnology
  • Annotation:
    The paper presents information about research and teaching in the field of photovoltaics at Czech Technical University, Faculty of Electrical Engineering, sylabus of lectures and exercises and descibes a demonstration photovoltaic 3kWp system on the Faculty roof.

A Comparison of Operating Conditions for Facade and On-Roof Applications of Photovoltaic Systems in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: The Integration of The Renewable Energy Systems into the Buildings Structures. Patras: TEI Patras, 2005. pp. 35-39. ISBN 960-7801-16-4.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    At the CTU FEE was built in the framework of this programme 3 kW system that is used not only for demonstration but also for study system performance under conditions of Prague agglomeration.

A Note on Trap Recombination in High Voltage Device Structures

  • DOI: 10.1016/j.microrel.2004.05.005
  • Link: https://doi.org/10.1016/j.microrel.2004.05.005
  • Department: Department of Electrotechnology
  • Annotation:
    In presented paper, recombination through traps (centres with a deep energy level between edge of bandgap and Fermi level) is discussed in more details. It has been shown that some traps can considerably influence recombination rate in silicon and that at some traps a considerable temperature dependence of the centre cross-sections may be found, as demonstrated on case of iridium. Further, the problem on low injection carrier lifetime in low-doped layers of high voltage semiconductor devices is also discussed

An Influence of Operating Temperature on the Photovoltaic System FV 2003A Efficiency

  • Authors: prof. Ing. Vítězslav Benda, CSc., Macháček, Z.
  • Publication: Applied Electronics 2005 - International Conference Pilsen. Plzeň: Západočeská universita, 2005. pp. 37-40. ISBN 80-7043-369-8.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    A 3 kWp photovoltaic on-grid system was built at the CTU FEE in the framework of the programme "Sun into Schools" that is used not only for demonstration but also for study system performance under conditions of Prague agglomeration. This paper presents same data about system performance in the period 2003-2004.

Diagnostics of Homogeneity of Recombination Rate in Individual Layers of Large-Area Silicon Solar Cells Using LBIV MethodDiagnostics of Homogeneity of Recombination Rate in Individual Layers

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Twentieth Europeand Photovoltaic Solar Energy Conference - Proceedings of the International Conference held in Barcelona, Spain. Munich: WIP - Renewable Energies, 2005. pp. 670-673. ISBN 3-936338-19-1.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check recombination rate distribution over the area of power (large-area) solar cells from measured values of open circuit voltage VOC using local irradiation by monochromatic light of different wavelengths (LBIV - Light Beam Initiated Voltage).

OCVD Carrier Lifetime Measurements on Diode Structures with Non-Uniform Distribution of Recombination Centres

  • Department: Department of Electrotechnology
  • Annotation:
    This paper investigates the problem of evaluating the lifetime of a carrier measured by the OCVD method on structures with a non-uniform carrier lifetime distribution, both axial and radial.

Performance of Photovoltaic on-grid System FV-2003A

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Socrates Programme An European Summer School ICT Tools on PV System Engineering Teaching and Learning. University of Patras, 2005. ISBN 960-7801-16-4.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    The paper describes the photovoltaic on-grid system FV-2003A localized on the roof of Faculty of Electrical Engineering. Peformance of the system in period 2001-2004 has been analyzed in details.

Solar Cell Fabrication Technology

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Socrates Programme An European Summer School ICT Tools on PV System Engineering Teaching and Learning. University of Patras, 2005. ISBN 960-7801-16-4.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    The paper describes basic technological proceses used in fabrication of photovoltaic cells and modules, both from crystalline silicon and thin films.

Solar Cell Physics and Construction

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Socrates Programme An European Summer School ICT Tools on PV System Engineering Teaching and Learning. University of Patras, 2005. ISBN 960-7801-16-4.
  • Year: 2005
  • Department: Department of Electrotechnology
  • Annotation:
    Paper describes basics of photovoltaic cell physics (photovoltaic effect, suitable materials), photovoltaic cell structure, and influence of individual construction factors on parameters and efficiency photovoltaic cells

The IEE Young Electrical Engineer's Competition 2005

A Quest for an Optimal Course on Photovoltaics

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: International Workshop on Teaching in Photovoltaics. Praha: Ediční středisko ČVUT, 2004. pp. 5-6. ISBN 80-01-02973-5.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    The workshop opening address summarises present development in the field of photovoltaics and discusses present and future needs of education and training specialists in the field.

Advances in power semiconductor devices

Development of a Course on Photovoltaic Systems

  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about problems connected with development of course on photovoltaics in the bachelor level of the study.

Diagnostics of Large-Area Solar Cell Homogeneity Using LBIV Method

  • Authors: prof. Ing. Vítězslav Benda, CSc., Asresahegn, A.
  • Publication: 24th International Conference on Microelectronics. Piscataway: IEEE, 2004. p. 671-674. ISBN 0-7803-8166-1.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check recombination rate distribution over the area of power (large area) solar cells from measured values of open circuit voltage at local irradiation (LBIV method)

Diagnostics of Recombination Rate Homogenity in Structures of Large-Area Solar Cells

  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check recombination rate distribution over the area of power solar cells from measured values of open circuit voltage using local irradiation by monochromatic light of different wavelengths (LBIV - Light Beam Initiated Voltage).

Fast Soft Recovery Diodes and Thyristors with Axial Lifetime Profile Created by Iridium Diffusion

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M.
  • Publication: The 4th International Power Electronics and Motion Control Conference. Xi'an: Xi'an University, 2004. pp. 332-337. ISBN 7-5605-1869-9.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    The results of a study carried out on P+PNN+ silicon power diodes diffused with iridium at temperatures ranging from 850 to 950 C are reported.

Fast Soft Recovery Thyristors Fabricated Using Iridium Diffusion

  • Authors: Černík, M., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 7th International Seminar on Power Semiconductor. Praha: Ediční středisko ČVUT, 2004. pp. 197-199. ISBN 80-01-03046-6.
  • Year: 2004

International Electronics Forum

Laboratory Exercises in a Course on Photovoltaics

  • Authors: prof. Ing. Vítězslav Benda, CSc., Zedník, J.
  • Publication: International Workshop on Teaching in Photovoltaics. Praha: Ediční středisko ČVUT, 2004. pp. 35-38. ISBN 80-01-02973-5.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about laboratory excercises (practicum) developed for a course on photovoltaics in the bachelor level of the study.

OCVD Carrier Lifetime in Diode Structutes with Axial Carrier Lifetime Gradient

  • Department: Department of Electrotechnology
  • Annotation:
    The OCVD (open circuit voltage decay) method is generally used method for determination carrier lifetime in structures of semiconductor devices.

Performance of Photovoltaic System FV-2003A

  • Authors: prof. Ing. Vítězslav Benda, CSc., Zedník, J.
  • Publication: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    To increase interest in the field of photovoltaics in the year 2000 was in the Czech Republic introduced programme "Sun into schools" providing to schools small photovoltaic on-grid systems to demonstrate possibilites of electricity generation by photovoltaics.

Photovoltaic Systems

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Workshop 2004. Praha: České vysoké učení technické v Praze, 2004. pp. 716-717. ISBN 80-01-02945-X.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    The paper describes developmentof the course curricula, esp. laboratory practicum for increasing the quality of laboratory exercises in photovoltaics

Photovoltaic Systems for Industry of Electrical Energy

Photovoltaic Systems for Product of Electrical Energy II

  • Department: Department of Electrotechnology
  • Annotation:
    The presented paper describes the economy view on the performance of photovoltaic systems and discusses future tremnds

Solar Cells Physics and Technology

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: European Summer School " ICT Tools in PV - Systems Engineering Teaching ang Learning". Patras: TEI Patras, 2004.
  • Year: 2004
  • Department: Department of Electrotechnology
  • Annotation:
    Publication gives basic physics and technology of photovoltaic cells and modules (crystalline silicon, thin films, advance device concepts)

A Course on Photovoltaic Systems at the Czech Technical University in Prague

  • Department: Department of Electrotechnology
  • Annotation:
    Curricula of a course on photovoltaic systems preformed at the Czech Technical University in Prague, Faculty of Electrical Engineering is presented. In the contribution is described the present state and compared with history and the project of the further development. Orientation of laboratory exercises towards application has been supposed.

A Note on Trap Recombination in High Voltage Device Structures

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 2003 IEEE Conference on Electron Devices and Solid-State Circuits. Hong Kong: Hong Kong University of Science and Technology, 2003. pp. 309-312. ISBN 0-7803-7749-4.
  • Year: 2003
  • DOI: 10.1109/EDSSC.2003.1283538
  • Link: https://doi.org/10.1109/EDSSC.2003.1283538
  • Department: Department of Electrotechnology
  • Annotation:
    In presented paper, recombination through traps (centres with a deep energy level between edge of bandgap and Fermi level) is discussed in more details. It has been shown that some traps can considerably influence recombination rate in silicon and that at some traps a considerable temperature dependence of the centre cross-sections may be found.

A Simple Method of Monitoring Recombination Centre Distribution in Structures of Large-Area Solar Cells

  • Authors: Asresahegn, A., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: International Conference on Advanced Engineering Design. Praha: Procesní inženýrství Ing. J. Novosad, 2003. pp. 230-231. ISBN 80-86059-35-9.
  • Year: 2003
  • Department: Department of Electrotechnology
  • Annotation:
    A simple method of monitoring recombination centre distribution in structures of arge-area photovoltaic cells has been dscribed. The method is based on local irradiation with monochromatic light.

Diagnostic of Recombination Centres in Solar Cells

  • Authors: Quan, T., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of Workshop 2003. Praha: České vysoké učení technické v Praze, 2003. pp. 762-763. ISBN 80-01-02708-2.
  • Year: 2003

Diagnostics of Inhomogencities in Structures of Large-Area Solar Cell by Local Irradiation

  • Authors: Asresahegn, A., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Diagnostika 03. Plzeň: ZČU FE, Odd. elektrotechnologie katedry el. strojů, 2003. pp. 167-170. ISBN 80-7082-952-4.
  • Year: 2003

Diagnostics of Large Area Solar Cell Homogenity by Local Irradiation

Education of Photovoltaics in CTU FEE

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ČVUT v evropském výzkumném a vzdělávacím prostoru. Praha: České vysoké učení technické v Praze, 2003. pp. 1-6. ISBN 80-01-02909-3.
  • Year: 2003

Monitoring of Large-Area Solar Cell Homogenity by Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc., Asresahegn, A., Radil, J.
  • Publication: 26th International Spring Seminar on Electronics Technology. Košice: Technical University of Košice, 2003. p. 295-297. ISBN 0-7803-8002-9.
  • Year: 2003
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check carrier lifetime distribution over the area of power (large-area) solar cells. The carrier lifetime in volume of the cell body can be evaluated using local irradiation of the surface of large-area solar cells with a laser diode (λ = 820 nm) from measured values of open circuit voltage VOC. The method can give information about recombination centres distribution in large-area solar cells.

Non-Destructive Characterisation of Recombination Centres in Large-Area Solar Cell Structures

  • Authors: prof. Ing. Vítězslav Benda, CSc., Quan, T., Asresahegn, A.
  • Publication: Micro Therm 2003. Lodz: Technical University of Lodz, 2003. pp. 127-132. ISBN 83-919353-0-2.
  • Year: 2003
  • Department: Department of Electrotechnology
  • Annotation:
    Low concentration of recombination centresin the volume of crystalline silicon solar cells is very important for fabrication of high-efficient solar cells. Fast and non-destructive diagnostics of solar cells can give information both about both input material and quality of technological operations.

Teaching Photovoltaics at FEE CTU in Prague

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Diagnostika a řízení jakosti v elektrotechnice. Praha: Ediční středisko ČVUT, 2003. pp. 69-72. ISBN 80-01-02785-6.
  • Year: 2003

Demonstration 3 kWp Photovoltaic System at the CTU Prague, Faculty of Electrical Engineering

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of Workshop 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 772-773. ISBN 80-01-02511-X.
  • Year: 2002

Diagnostics of Large-Area Solar Cell Homogeneity by Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Photovoltaics and Photoactive Materials - Properties, Technology and Applications - NATO Science Series. Dordrecht: Kluwer Academic Publishers, 2002. pp. 289-292. ISBN 1-4020-0823-6.
  • Year: 2002
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check carrier lifetime distribution over the area of power (large-area) solar cells. The carrier lifetime in volume of the cell body can be evaluated using local irradiation of the surface of large-area solar cells with a laser diode (λ = 820 nm) from measured values of open circuit voltage VOC. The method can give information about recombination centres distribution in large-area solar cells.

Diagnostics of Recombination Centers in Structure of Large-Area solar Cells by Measuring Forward Characteristics in the Dark

  • Authors: Quan, T., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ISSE 2002. Praha: ČVUT FEL, Katedra elektrotechnologie, 2002. pp. 139-141. ISBN 0-7803-9824-6.
  • Year: 2002
  • Department: Department of Electrotechnology
  • Annotation:
    Diagnostics of recombination centers in structure of large-area solar cells by measuring forward characteristics in the dark was presented. The method is nendestructiv and suitable for in-process checking

In-Process Diagnostics of Recombination Centres in Structures of Large-Area Solar Cells

  • Authors: prof. Ing. Vítězslav Benda, CSc., Radil, J., Quan, T.
  • Publication: Proceedings MIEL 2002. Niš: IEEE Electron Devices Society, 2002. pp. 323-326. ISBN 0-7803-7235-2.
  • Year: 2002
  • DOI: 10.1109/MIEL.2002.1003202
  • Link: https://doi.org/10.1109/MIEL.2002.1003202
  • Department: Department of Electrotechnology
  • Annotation:
    The paper refers about a possibility to check carrier lifetime in the area close to the PIN junction measuring forward characteristics at low current densities, where generation-recombination portion of the current density dominates. The measurement allows to determine energy level of dominant recombination centres and evaluate their concentration.

New materials for power semiconductor devices

  • Department: Department of Electrotechnology
  • Annotation:
    New materials, mainly SiC and GaN, prospective for the use in the field of power semiconductor devices were discussed.

OCVD Carrier Lifetime Measurements on an Inhomogeneous Diode Structure

  • Department: Department of Electrotechnology
  • Annotation:
    The paper investicates the problem of evaluating the carrier lifetime measured by the OCVD method on diode structures with non-uniform carrier lifetime distribution. A simple model of two diodes conected in parallel (lumped charge approximation) has been used for evaluating the measured carrier lifetime. The theoretical analysis was experimentaly verified and discussed.

OCVD Carrier Lifetime Measurements on an Inhomogeneous Diode Structure

  • Authors: prof. Ing. Vítězslav Benda, CSc., Novák, Z.
  • Publication: Proceedings MIEL 2002. Niš: IEEE Electron Devices Society, 2002. pp. 393-395. ISBN 0-7803-7235-2.
  • Year: 2002
  • DOI: 10.1109/MIEL.2002.1003220
  • Link: https://doi.org/10.1109/MIEL.2002.1003220
  • Department: Department of Electrotechnology
  • Annotation:
    The paper investicates the problem of evaluating the carrier lifetime measured by the OCVD method on diode structures with non-uniform carrier lifetime distribution. A simple model of two diodes conected in parallel (lumped charge approximation) has been used for evaluating the measured carrier lifetime. The theoretical analysis was experimentaly verified.

Performance Degradation of Silicon Solar Cells at Non-Optimal Conditions

  • Authors: prof. Ing. Vítězslav Benda, CSc., El-Minir, K., Kudláček, I.
  • Publication: Proceedings of Workshop 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 768-769. ISBN 80-01-02511-X.
  • Year: 2002

Photovoltaics at the Czech Technical University, Faculty of Electrical Engineering

Some Aspects of Optimisation of Performance of Photovoltaic Systems

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Elektroenergetika 2002. Praha: České vysoké učení technické v Praze, 2002. pp. 343-346. ISBN 80-01-02614-0.
  • Year: 2002

Surge characteristics of fast soft reverse recovery diodes diffused with iridium

  • Authors: Černík, M., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the 6th International Seminar on Power Semiconductors. Praha: Vydavatelství ČVUT, 2002. pp. 189-193. ISBN 80-01-02595-0.
  • Year: 2002

Actual Optical and Thermal Performance of Photovoltaic Modules

Clear Separation of Seasonal Effect on the Performance of Monocrystalline Silicon

  • Authors: El-Minir, K., prof. Ing. Vítězslav Benda, CSc., Tousek, J., Kudláček, I.
  • Publication: 16th International Conference on Production Research (ICPR-16). Praha: Český svaz vědeckotechnických společností, 2001. pp. 250-258. ISBN 80-02-01438-3.
  • Year: 2001

Comparison Between Atmospheric Turbidity Coefficients of Desert and Temperate Climates

  • Department: Department of Electrotechnology
  • Annotation:
    Presented paper deals with comparison between atmospheric turbidity coefficients of desert and temperate climates and discusses a possible influence on photovolatic system efficiency

Development of the Course on Photovoltaic Systems

Diagnostics of silicon solar cells

  • Authors: prof. Ing. Vítězslav Benda, CSc., Quan, T.
  • Publication: Diagnostika '01. Plzeň: Západočeská universita, 2001. pp. 175-178. ISBN 80-7082-742-4.
  • Year: 2001

Diagnostics oj Large Area Solar Cells Homogeneity by Local Irradiation

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: NATO ASI Photovoltaic and Photoactive Materials - Properties, Technology and Applications. Sofia: Bulgarian Academy of Sciences, Institut of Chemical Engineering, 2001. pp. 55.
  • Year: 2001

Effect of Dust Optical Properties on the Performance of Photovoltaic Solar Cells

Effects of Solar Irradiation Conditions and Other Factors on the Outdoor Performance of Photovoltaic Modules

  • Authors: El-Minir, K., prof. Ing. Vítězslav Benda, CSc., Toušek, J.
  • Publication: Journal of Electrical Engineering. 2001, 52(5-6), 125-133. ISSN 0013-578X.
  • Year: 2001

Estimation of Solar Radiations Incident on a Photovoltaic Solar Module usingg Neeural Networks

  • Authors: El-Minir, K., Alam, J.J., Rahuma, U.A., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of XXVI. Seminar ASR. Ostrava: Technická univerzita, 2001. pp. 14-21. ISBN 80-7078-890-9.
  • Year: 2001

Fast Soft Reverse Recovery Diodes with Axial Lifetime Profile Created by Iridium Diffusion

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: International Conference on Advanced Engineering Design. Glasgow: University of Glasgow, 2001. pp. 333-338. ISBN 0-85261-731-3.
  • Year: 2001
  • Department: Department of Electrotechnology
  • Annotation:
    The results of a study carried out on P+PNN+ silicon power diodes with an axial lifetime profile created by iridium diffusion at temperatures ranging from 850 to 950 C are reported.

iagnostics of Recombination Centres in Structures of Large-Area Solar Cells

  • Authors: prof. Ing. Vítězslav Benda, CSc., Quan, T.
  • Publication: International Conference Applied Electronics 2001. Plzeň: Západočeská universita, 2001. pp. 15-18. ISBN 80-7082-758-0.
  • Year: 2001

Modelling of the Temperaure Distribution in Solar cells

  • Authors: prof. Ing. Vítězslav Benda, CSc., El-Minir, K.
  • Publication: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 676-677. ISBN 80-01-02335-4.
  • Year: 2001

On the Choice of the Optimum Tilt of PV Arrays

  • Authors: El-Minir, K., prof. Ing. Vítězslav Benda, CSc., Kudláček, I.
  • Publication: New Trends in Physics. Brno: VUT v Brně, FEI, 2001. pp. 74-79. ISBN 80-214-1992-X.
  • Year: 2001

Solar Radiation on Tilted South Oriented Surfaces - I. Validation of Transfer Model

  • Authors: El-Minir, K., Rabab, H.A., Fathy, A.M., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Solar Energy and Applied Photochemistry. Cairo: Ain Shams University, 2001. pp. 256-273.
  • Year: 2001

Solar Radiation on Tilted South Oriented Surfaces - II. On the Choice of the Angle of Tilt for South Facing Solar Collectors

  • Authors: El-Minir, K., Fathy, A.M., Raba, H.A., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Solar Energy and Applied Photochemistry. Cairo: Ain Shams University, 2001. pp. 274-285.
  • Year: 2001

Diagnostic of Large-Area Solar Cells by Local Irradiation

  • Authors: Radil, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 22nd International Conference on Microelectronics. Niš: IEEE Electron Devices Society, 2000. p. 205-207. ISBN 0-7803-5235-1.
  • Year: 2000
  • DOI: 10.1109/ICMEL.2000.840556
  • Link: https://doi.org/10.1109/ICMEL.2000.840556
  • Department: Department of Electrotechnology
  • Annotation:
    This paper presents a method for determining of local defects, which bring down efficiency and reliability of solar cells, using local irradiation of the surface of large-area solar cells. The method can give information about position and extent of local defects.

Methods of Monitoring Carrier Lifetime Distribution at Large-Area Semiconductor

Present Problems of Reliability of Power Semiconductor Devices

  • Department: Department of Electrotechnology
  • Annotation:
    Present problems of reliability of oower semiconductors devices, namely thermal breakdown and thermal fatigue are discussed in details

Solar Cells Efficiency Variations with Varying Environmental Factors

  • Authors: El-Minir, K., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Poster 2000. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2000. pp. EE3.
  • Year: 2000

Temperature Distribution in Solar Cells Calculated in Three Dimensional Approach

  • Department: Department of Electrotechnology
  • Annotation:
    Temperature distribution in solar cells in three dimensional approach has been calculated. The inhomogeneous temperature distribution has been discussed

The Influence of Iridium Diffusion on Parameters of Power Diodes

  • Authors: Černík, M., Školník, V., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ISPS'2000 Proceedings. Praha: České vysoké učení technické v Praze, 2000. pp. 165-168. ISBN 80-01-02195-5.
  • Year: 2000

Determination of Athmospheric Turbidity in Czech Republic

  • Authors: El-Minir, K., prof. Ing. Vítězslav Benda, CSc., Toušek, J., Kudláček, I.
  • Publication: Silnoproudá elektrotechnika a elektroenergetika na přelomu tisíciletí. Brno: VUT v Brně, FEI, 1999. pp. 55-60. ISBN 80-214-1419-7.
  • Year: 1999

Diagnostic of Carrier Lifetime Distribution at Large-area Semiconductor Structures

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: 22nd International Spring Seminar on Electronics Technology 1999. Dresden: Electronics Technology Laboratory of the Dresden University of Technology, 1999. pp. 127-131. ISBN 3-934142-00-1.
  • Year: 1999
  • Department: Department of Electrotechnology
  • Annotation:
    In the presented paper, a method for determining carrier lifetime distribution over the area of power devices is described

Diagnostics of Large-area Solar Cells

New materials

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Materiály pro elektroniku a elektrotechniku. Ostrava: Tanger, 1999. pp. 98-102. ISBN 80-85988-29-1.
  • Year: 1999

New Materials for Power Semiconductor Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Materiály pro elektroniku a elektrotechniku. Ostrava: Tanger, 1999. pp. 98-103. ISBN 80-85988-29-1.
  • Year: 1999

Power Semiconductor Devices

  • Department: Department of Electrotechnology
  • Annotation:
    Use of physical modelsto explain the device structures and functions without complicated mathematical techniques. Explanation of the structure, function, characteristics, and features of the most important discrete and integrated power devices. DEmonstration of the influence of construction and technological parameters on important device characteristics. Section on power modules and conditions for reliable operations and a look for future materials and devices

Present Problems of Reliability of Power Semiconductors Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: First International Conference on Advanced Engineering Design - Proceedings. Praha: České vysoké učení technické v Praze, 1999. pp. 120. ISBN 80-01-02055-X.
  • Year: 1999
  • Department: Department of Electrotechnology
  • Annotation:
    Present problems of reliability of oower semiconductors devices, namely thermal breakdown and thermal fatigue are discussed in details

The Influence of a Carrier Lifetime on Quality of Solar Cells

  • Authors: Radil, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Poster 1999. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1999. pp. 6.
  • Year: 1999

The Influence of Temperature on Carrier Lifetime Ir Diffused Devices

  • Authors: Novák, Z., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Poster 1999. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1999. pp. 4.
  • Year: 1999

The Quest for the Perfect Switch

  • Department: Department of Electrotechnology
  • Annotation:
    The most progressive trends in the field of power semiconductor devices are recapitulated. On this background, the best papers from the conference ISPS´98 (Prague, 1998) have been presented this Special Issue as a selection represented curret research in the field.

Trends in the Field of Power Semiconductors

A Note on Trap Recombination Lifetime in Power Semiconductors Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M., Novák, Z.
  • Publication: ISPS'98 Proceedings. Praha: České vysoké učení technické v Praze, 1998. pp. 59-64. ISBN 80-01-01852-0.
  • Year: 1998
  • Department: Department of Electrotechnology
  • Annotation:
    Recombination through traps is discussed in more details. It has been shown that at some traps a considerable temperature dependence of the centre capture cross-section may be found

A Wide-band Curent Sensor for Power Electronics

  • Department: Department of Electrotechnology
  • Annotation:
    A resistive current sensor with a wide frequency band (from DC to several MHz) for the use in power electronics. The sensor is constructed as a volume resistor (1-10 mOhms) with minimum parasitics

A Wide-band Current Sensor

  • Department: Department of Electrotechnology
  • Annotation:
    A resistive current sensor with a wide frequency band (from DC to several MHz) for the use in power electronics. The sensor is constructed as a volume resistor (1-10 mOhms) with minimum parasitics

Characterisation of Solar Cells by Local Irradiation

  • Authors: Radil, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Thermal Problems in Electronics. Wroclaw: Technical University, 1998. pp. 1-4. ISBN 83-87202-66-5.
  • Year: 1998

Deep energy levels in power diodes introduced by iridium difusion

  • Department: Department of Electrotechnology
  • Annotation:
    Deep energy levels introduced into power diode structures have been measured by the DLTS method. The influence on the diode reverse recovery has been dicussed. The iridium difffusion has been foun as an effective method for soft reverse recovery diode fabrication.

DIMOWIN - Modelling Diode Reverse Recovery Process for Education

  • Authors: Černík, M., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: ISPS'98 Proceedings. Praha: České vysoké učení technické v Praze, 1998. pp. 133-136. ISBN 80-01-01852-0.
  • Year: 1998
  • Department: Department of Electrotechnology
  • Annotation:
    The educational programme DIMOWIN is suitable to observe basic technological effects on dynamics of reverse recovery process of power diodes

In-Process Monitoring of Carrier Lifetime Distribution in Technology of Large-Area Power Semiconductor Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc., Kožíšek, J.
  • Publication: PEMC 98. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1998. p. 26-30. ISBN 80-01-01832-6.
  • Year: 1998
  • Department: Department of Electrotechnology
  • Annotation:
    A simple optical method for non destructive in-process monitoring of carrier lifetime distribution in technology of large-area power semiconductor devices has been developed

Iridium Diffusion Influence on Carrier Lifetime in Diode Structures

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M., Štěpková, D.
  • Publication: Workshop 98. Praha: České vysoké učení technické v Praze, 1998, pp. 107-108.
  • Year: 1998

The Influence of Temperature on Carrier Liftime Ir Difused Devices

  • Authors: Novák, Z., Černík, M., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Microtechnology and Termal Problems in Electronics. Warsaw: Technical University, 1998. p. 12-16. ISBN 83-87202-66-5.
  • Year: 1998

Deep Energy Lavel in Power Diodes Introduced by Iridium Diffusion

  • Department: Department of Electrotechnology
  • Annotation:
    The influence of iridium diffusion on prameters of pover diodes. Iridium-related deep energy levels were measured using DLTS Method. The dominant recombination centre is of energy 0,28 eV below the conduction band.

Some Aspects of Reliability of Power Semiconductor Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Education and Research in Microelectronics. Wroclaw: Technical University, 1997. pp. 126-131. ISBN 83-905990-5-8.
  • Year: 1997
  • Department: Department of Electrotechnology
  • Annotation:
    Present problems of reliability of oower semiconductors devices, namely thermal breakdown and thermal fatigue are discussed in details

The Influence of Iridium Diffusion on Parameters of Power Diodes

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M., Štěpková, D.
  • Publication: Workshop 97. Praha: České vysoké učení technické v Praze, 1997. pp. 911-912.
  • Year: 1997

A Note on the Problem of the Uniformity of the Carrier Lifetime Distribution in High-power Devices

  • Authors: Kožíšek, J., prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the 3rd International Seminar on Power Semiconductors ISPS 96. Praha: České vysoké učení technické v Praze, 1996. pp. 19-24.
  • Year: 1996

An Equipment for Checking of Carrier Lifetime Distribution in PNP Structures

Deep Energy Levels in N-Type Si Introduced by Short-Time Pd Diffusion

  • Authors: prof. Ing. Vítězslav Benda, CSc., Fučíková, J., Štěpková, D.
  • Publication: Workshop 96. Praha: České vysoké učení technické v Praze, 1996, pp. 59-60.
  • Year: 1996

Monitoring of Carrier Lifetime Distribution of Large Area PNP Structures

  • Authors: prof. Ing. Vítězslav Benda, CSc., Kožíšek, J.
  • Publication: Proceedings of the 5th Scientific and Business Conference SILICON 96. Rožnov pod Radhoštěm: TECON-Scientific, 1996, pp. 242-249.
  • Year: 1996

Reliability of Power Semiconductor Devices - Problems and Trends

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceedings of the 7th International Power Electronics and Motion Control Conference. Budapest: Technical University, 1996. pp. 30-35. ISBN 963-420-487-8.
  • Year: 1996
  • Department: Department of Electrotechnology
  • Annotation:
    The paper gives survay on reliability problems in the field of pover semiconductor devices (second breakdown, thermal fatigue, etc.)

Soft Reverse Recovery Power Diodes Diffused with Iridum

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M., Štěpková, D.
  • Publication: Power Electronics and Variable Speed Drives, IEE Conference Publication No.429. London: Institution of Electrical Engineers, 1996. p. 19-24.
  • Year: 1996

Some Aspects of Laboratory Excercises on Semiconductor Device Fabrication Technology

  • Authors: prof. Ing. Vítězslav Benda, CSc., Fučíková, J.
  • Publication: Proceedings of the European Workshop Microelectronics Education. Singapore: World Scientific, 1996. pp. 261-264. ISBN 981-02-2653-5.
  • Year: 1996

The Influence of Iridium Diffusion on Parameters of Power Diodes

  • Authors: prof. Ing. Vítězslav Benda, CSc., Černík, M., Štěpková, D.
  • Publication: Proceedings of the 3rd International Seminar on Power Semiconductors ISPS 96. Praha: České vysoké učení technické v Praze, 1996. pp. 19-24.
  • Year: 1996

A Study of the Dynamic Behaviour of Voltage Controlled Power Devices Extreme Conditions

Deep Energy Levels in N-Type Silicon Introduced by Palladium Diffusion

  • Authors: prof. Ing. Vítězslav Benda, CSc., Štěpková, D., Fučíková, J.
  • Publication: Proceeding of CAS 95. Piscataway: IEEE, 1995. pp. 163-166. ISBN 0-7803-2647-4.
  • Year: 1995
  • Department: Department of Electrotechnology
  • Annotation:
    The results of a study carried out on N-type silicon diffused with palladim at temperature 860°C using DLTS method are reported. In the case of short diffusion, two significant energy levels (Ec - 0.22 eV and Ec - 0.37 EV) were found , at long diffusion time only one level (Ec - 0.22 eV) was found. The level Ec - 0.22 eV may be related to Pd in substitutional positions and the level Ec - 0.37 eV to Pd in substitutional positions.

Deep Energy Levels in Power Diodes Introduced by Palladium Diffusion

  • Authors: prof. Ing. Vítězslav Benda, CSc., Štěpková, D.
  • Publication: Proceeding of ISSE 95. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1995. pp. 172-177.
  • Year: 1995

In Process Cheking of Carrier Lifetime Distribution in High-Power Devices

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Proceeding of the 20th International Conference on Microelectronics MIEL 95. Piscataway: IEEE, 1995. pp. 403-407. ISBN 0-7803-2786-1.
  • Year: 1995
  • Department: Department of Electrotechnology
  • Annotation:
    In the presented paper, a method for determining carrier lifetime distribution over the area of power devices is described

Measurement of Deep Levels in Power Silicon Devices Using TSC Method

Microwave Quality Testing of Ceramic Materials

The Influence of the Palladium Diffusion on Carrier Lifetime in Power Diode Structures

  • Authors: Štěpková, D., prof. Ing. Vítězslav Benda, CSc., Fučíková, J.
  • Publication: Workshop 95. Praha: České vysoké učení technické v Praze, 1995. pp. 453-454.
  • Year: 1995

A Note on the Charge Analysis Approach of Power Diodes Reverse Recovery

  • Authors: prof. Ing. Vítězslav Benda, CSc., Kang, Ch.H., Klabačka, E.
  • Publication: Proceedings of the 2nd International Seminar on Power Semiconductors. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1994. pp. 53-60.
  • Year: 1994
  • Department: Department of Electrotechnology
  • Annotation:
    A physical model of the power diode reverse recovery in the charge analysis approach respecting construction and technology has been described and experimentally verified

Diagnostic Methods in Electrotechnology

Improving of Large-area GTO Homogenity by Electron Irradiation

  • Department: Department of Electrotechnology
  • Annotation:
    Improving of large-area GTO homogenity by electron irradiation has been reported. The GTO homogeneity was checked by measuring the current gains distribution over the GTO structure

Laboratory Exercices on Power Semiconductor Devices Fabrication

  • Authors: prof. Ing. Vítězslav Benda, CSc., Fučíková, J., Neužil, P.
  • Publication: Proceeding of 2nd International Seminar on Power Semiconductors. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1994, pp. 173-179.
  • Year: 1994

A Simple Method of in-process Checking of the Large-Area GTO Homogenity

A Simple Optical Method of in-process Checking of the Lage Area GTO Homogenity

  • Authors: prof. Ing. Vítězslav Benda, CSc., Špůr, P., Martínek, J., Pína, B.
  • Publication: Power Electronics and Applications. London: Institution of Electrical Engineers, 1993. pp. 69-72. ISSN 0537-9989. ISBN 0-85296-584-2.
  • Year: 1993

Design Considerations for Fast Soft Reverse Recovery Diodes

  • Authors: prof. Ing. Vítězslav Benda, CSc.,
  • Publication: Power Electronics and Applications. London: Institution of Electrical Engineers, 1993. p. 288-292. ISSN 0537-9989. ISBN 0-85296-584-2.
  • Year: 1993
  • Department: Department of Electrotechnology
  • Annotation:
    On the base of detail analysis of the diode reverse recovery process, considerations for design of soft reverse recovery devices have been presented

Diagnostic Method of High-Power GTO

The Use of Composite Solders in Technology of Power Semiconductor Devices and Power Hybrids

  • Authors: prof. Ing. Vítězslav Benda, CSc., Grin, E.
  • Publication: Transaction of the University of Kosice. Vol 2, No. 1. Cambridge: Riecansky Science, 1993, pp. 21-22.
  • Year: 1993

Thermal Oxidation of Silicon Using 1,2 - Dichlorethan

Using Carrier Lifetime Dependences on Temperature and Current Density in Diagnostics of Silicon Structures

  • Department: Department of Electrotechnology
  • Annotation:
    This paper presented a simple method for determining the deep energy level, which influences predominantly the carrier lifetime in the working temperature range of a semiconductor devices, using the dependence of carrier lifetime on the current density and temperature.

Responsible person Ing. Mgr. Radovan Suk