The Experts below are selected from a list of 71415 Experts worldwide ranked by ideXlab platform
Junji Kido - One of the best experts on this subject based on the ideXlab platform.
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Soluble squaraine derivatives for 4.9% efficient organic Photovoltaic Cells
RSC Advances, 2014Co-Authors: Hisahiro Sasabe, Tsukasa Igrashi, Ziruo Hong, Yusuke Sasaki, Guo Chen, Junji KidoAbstract:A series of soluble squaraine derivatives has been designed and developed as a donor material for solution-processible organic Photovoltaic Cells. In combination with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as an acceptor, we obtained a power conversion efficiency of 4.86% from bulk-heterojunction Photovoltaic Cells.
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Optical and electrical properties of a squaraine dye in Photovoltaic Cells
Applied Physics Letters, 2012Co-Authors: Guo Chen, Hisahiro Sasabe, Ziruo Hong, Daisuke Yokoyama, Yang Yang, Junji KidoAbstract:2,4-Bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) was employed as a donor material in organic Photovoltaic Cells based on planar heterojunctions. We studied optical properties of SQ films, and discussed its Photovoltaic performance via numerical fitting and simulation on the Photovoltaic Cells. Exciton diffusion length (LD) in SQ films (4.5 nm) derived from optical simulation should be the major limitation to efficiency, consistent with external quantum efficiency data. Thermal treatment improved efficiency, which can be ascribed to reduced saturation current of the Photovoltaic Cells. As a result, a power conversion efficiency of 4.1% was achieved.
Mehra Ameri - One of the best experts on this subject based on the ideXlab platform.
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improving the effectiveness of a Photovoltaic water pumping system by spraying water over the front of Photovoltaic Cells
Renewable Energy, 2009Co-Authors: Morteza Abdolzadeh, Mehra AmeriAbstract:The Photovoltaic Cells will exhibit long-term degradation if the temperature exceeds a certain limit. Photovoltaic Cells are the heart of Photovoltaic water pumping systems. In order to utilize PV power and increase Photovoltaic water pumping system efficiency, it is necessary to keep PV cell temperature and cell reflection as low as possible. The purpose of this study is to investigate the possibility of improving the performance of a Photovoltaic water pumping system. This is performed by spraying water over the Photovoltaic Cells. The results are compared with traditional systems. Experimental results show that the Cells power is increased due to spraying water over the Photovoltaic Cells. This can significantly increase the system and subsystem efficiency and the pump flow rate when operating under different heads. Measurements of the short circuit current of the module, which is nearly temperature-independent, indicated that the water spray improved the system optical performance.
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Improving the Effectiveness of a Photovoltaic Water Pump System by Applying Water Flow Over Photovoltaic Cells
Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 2008Co-Authors: Morteza Abdolzadeh, Mehra AmeriAbstract:The Photovoltaic Cells will exhibit long-term degradation if the temperature exceeds a certain limit. Photovoltaic Cells are at the heart of Photovoltaic water pump systems. In order to utilize PV power and increase Photovoltaic water pump system efficiency, it is necessary to keep PV cell temperature low. The purpose of this study is to investigate the possibility of improving the performance of a Photovoltaic water pump system by applying water flow over the Photovoltaic Cells, which is investigated and compared with traditional systems. In order to examine the effect of spraying water flow over Photovoltaic cell, we have installed a Photovoltaic water pump system and investigated the effectiveness of cooling Photovoltaic Cells on the Photovoltaic water pump system performance. To cool Photovoltaic Cells, different designs were considered and among all of them the most economical and effective one has been chosen and mounted on the Photovoltaic Cells. The water supplied for spraying over the Photovoltaic Cells is fed by the pump. Experimental results show that the Cells power increased due to spreading water flow over the Photovoltaic Cells can increase significantly system and subsystem efficiency and the pump flow rate in different heads.
Morteza Abdolzadeh - One of the best experts on this subject based on the ideXlab platform.
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improving the effectiveness of a Photovoltaic water pumping system by spraying water over the front of Photovoltaic Cells
Renewable Energy, 2009Co-Authors: Morteza Abdolzadeh, Mehra AmeriAbstract:The Photovoltaic Cells will exhibit long-term degradation if the temperature exceeds a certain limit. Photovoltaic Cells are the heart of Photovoltaic water pumping systems. In order to utilize PV power and increase Photovoltaic water pumping system efficiency, it is necessary to keep PV cell temperature and cell reflection as low as possible. The purpose of this study is to investigate the possibility of improving the performance of a Photovoltaic water pumping system. This is performed by spraying water over the Photovoltaic Cells. The results are compared with traditional systems. Experimental results show that the Cells power is increased due to spraying water over the Photovoltaic Cells. This can significantly increase the system and subsystem efficiency and the pump flow rate when operating under different heads. Measurements of the short circuit current of the module, which is nearly temperature-independent, indicated that the water spray improved the system optical performance.
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Improving the Effectiveness of a Photovoltaic Water Pump System by Applying Water Flow Over Photovoltaic Cells
Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 2008Co-Authors: Morteza Abdolzadeh, Mehra AmeriAbstract:The Photovoltaic Cells will exhibit long-term degradation if the temperature exceeds a certain limit. Photovoltaic Cells are at the heart of Photovoltaic water pump systems. In order to utilize PV power and increase Photovoltaic water pump system efficiency, it is necessary to keep PV cell temperature low. The purpose of this study is to investigate the possibility of improving the performance of a Photovoltaic water pump system by applying water flow over the Photovoltaic Cells, which is investigated and compared with traditional systems. In order to examine the effect of spraying water flow over Photovoltaic cell, we have installed a Photovoltaic water pump system and investigated the effectiveness of cooling Photovoltaic Cells on the Photovoltaic water pump system performance. To cool Photovoltaic Cells, different designs were considered and among all of them the most economical and effective one has been chosen and mounted on the Photovoltaic Cells. The water supplied for spraying over the Photovoltaic Cells is fed by the pump. Experimental results show that the Cells power increased due to spreading water flow over the Photovoltaic Cells can increase significantly system and subsystem efficiency and the pump flow rate in different heads.
Petru A. Cotfas - One of the best experts on this subject based on the ideXlab platform.
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Application of successive discretization algorithm for determining Photovoltaic Cells parameters
Energy Conversion and Management, 2019Co-Authors: Daniel T. Cotfas, Adrian Deaconu, Petru A. CotfasAbstract:Abstract The extraction of the Photovoltaic Cells and panels parameters still represents a hot topic, despite the numerous methods proposed by researchers in scientific literature. In order to optimize the efficiency of Photovoltaic Cells and panels and to predict the energy they generate, it is useful to accurately calculate their parameters function of temperature and irradiance. This paper proposes the Successive discretization algorithm developed to extract five parameters of Photovoltaic Cells and panels using the current voltage characteristic and the one diode model. Three widely used standard datasets, one for the Photovoltaic cell and two for Photovoltaic panels, are utilized. Other three datasets are analyzed, one measured in laboratory conditions for the monocrystalline Photovoltaic cell and two under natural sunlight for the monocrystalline Photovoltaic panel. The proposed algorithm proves its performance through comparison with other over twenty accepted methods used in specialized literature. The comparison is made for five parameters and the root mean square error. The obtained results demonstrate that the method presented is one of the best and it increases the determination accuracy of important Photovoltaic Cells’ parameters. Thus, the Successive discretization algorithm is a very good candidate as tool for extracting the Photovoltaic Cells and panels parameters.
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Using the genetic algorithm to determine the parameters of Photovoltaic Cells and panels
2018 International Symposium on Electronics and Telecommunications (ISETC), 2018Co-Authors: Daniel T. Cotfas, Petru A. Cotfas, Angel CataronAbstract:Heuristic methods are used more and more often to determine the parameters of Photovoltaic Cells and panels. The results obtained using these methods are better than the results obtained through analytical ones. The genetic algorithm is used in this paper to determine the major parameters of the Photovoltaic Cells and panels for a one diode model. The current voltage characteristics of the Photovoltaic Cells are measured under illumination in lab conditions and for the Photovoltaic panels in natural sunlight conditions.
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Study of Temperature Coefficients for Parameters of Photovoltaic Cells
International Journal of Photoenergy, 2018Co-Authors: Daniel T. Cotfas, Petru A. Cotfas, Octavian Mihai MachidonAbstract:The temperature is one of the most important factors which affect the performance of the Photovoltaic Cells and panels along with the irradiance. The current voltage characteristics, I-V, are measured at different temperatures from 25°C to 87°C and at different illumination levels from 400 to 1000 W/m2, because there are locations where the upper limit of the Photovoltaic Cells working temperature exceeds 80°C. This study reports the influence of the temperature and the irradiance on the important parameters of four commercial Photovoltaic cell types: monocrystalline silicon—mSi, polycrystalline silicon—pSi, amorphous silicon—aSi, and multijunction InGaP/InGaAs/Ge (Emcore). The absolute and normalized temperature coefficients are determined and compared with their values from the related literature. The variation of the absolute temperature coefficient function of the irradiance and its significance to accurately determine the important parameters of the Photovoltaic Cells are also presented. The analysis is made on different types of Photovoltaics Cells in order to understand the effects of technology on temperature coefficients. The comparison between the open-circuit voltage and short-circuit current was also performed, calculated using the temperature coefficients, determined, and measured, in various conditions. The measurements are realized using the SolarLab system, and the Photovoltaic cell parameters are determined and compared using the LabVIEW software created for SolarLab system.
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Accelerated Life Test for Photovoltaic Cells Using Concentrated Light
International Journal of Photoenergy, 2016Co-Authors: Daniel T. Cotfas, Petru A. Cotfas, D. Floroian, Laura FloroianAbstract:This paper presents a new method developed to significantly reduce the necessary time for the ageing tests for different types of Photovoltaic Cells. Two ageing factors have been applied to the Photovoltaic Cells: the concentrated light and the temperature. The maximum power of the Photovoltaic Cells was monitored during the ageing process. The electrical dc and ac parameters of the Photovoltaic Cells were measured and analyzed at 1 sun irradiance, before and after the test stress. During the test, two Photovoltaic Cells are kept at maximum power point and the other two are kept at open circuit voltage point. The method is validated through the results obtained for the monocrystalline silicon solar cell.
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The study of the Photovoltaic Cells parameters in concentrated sunlight
2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2014Co-Authors: Daniel T. Cotfas, Petru A. Cotfas, D. Floroian, Laura Floroian, Rachamim Rubin, Doron LiebermanAbstract:The Photovoltaic cell parameters are very important for researchers and manufacturers to improve the efficiency of these devices. There are many studies for these parameters in sunlight at one sun or at some suns, but few studies at hundreds or thousands suns. In this paper is presented the study of all important parameters of three types of Photovoltaic Cells under concentrated sunlight.
Guo Chen - One of the best experts on this subject based on the ideXlab platform.
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Soluble squaraine derivatives for 4.9% efficient organic Photovoltaic Cells
RSC Advances, 2014Co-Authors: Hisahiro Sasabe, Tsukasa Igrashi, Ziruo Hong, Yusuke Sasaki, Guo Chen, Junji KidoAbstract:A series of soluble squaraine derivatives has been designed and developed as a donor material for solution-processible organic Photovoltaic Cells. In combination with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as an acceptor, we obtained a power conversion efficiency of 4.86% from bulk-heterojunction Photovoltaic Cells.
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Optical and electrical properties of a squaraine dye in Photovoltaic Cells
Applied Physics Letters, 2012Co-Authors: Guo Chen, Hisahiro Sasabe, Ziruo Hong, Daisuke Yokoyama, Yang Yang, Junji KidoAbstract:2,4-Bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) was employed as a donor material in organic Photovoltaic Cells based on planar heterojunctions. We studied optical properties of SQ films, and discussed its Photovoltaic performance via numerical fitting and simulation on the Photovoltaic Cells. Exciton diffusion length (LD) in SQ films (4.5 nm) derived from optical simulation should be the major limitation to efficiency, consistent with external quantum efficiency data. Thermal treatment improved efficiency, which can be ascribed to reduced saturation current of the Photovoltaic Cells. As a result, a power conversion efficiency of 4.1% was achieved.
