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Simulation Suggests Origin of Potential Induced Degradation of Solar Cell  [PDF]
Masato Ohmukai, Akira Tsuyoshi
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.56004
Abstract: Solar cells are well known as devices for sustainable electric energy generation. Nowadays the potential induced degradation has been brought up as an obstacle problem for practical use. In order to determine the cause of this kind of degradation, numerical simulation by a finite difference time domain method has been performed for computational electromagnetics in the case that the thunder attacks the solar modules. The results show that the dielectric breakdown in the glass covered over the solar cells triggered by the thunderstroke is critical. So it is helpful to protect the dielectric breakdown in the glass from the thunderstroke.
Normalized Area Solar Cell and Potential Applications  [PDF]
Marcel Pasquinelli, Jean-Jacques Simon, Judikael Le Rouzo, Fran?ois Flory, Ludovic Escoubas
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.55097
Abstract: Nowadays in laboratories and in industries, distribution of solar cells sizes could be very large, hence; for the first time it is rather difficult to compare photovoltaic parameters which are size dependent (current, serial resistance, shunt resistance...) and performances of these cells. Also, it will be useful for scale effect to extrapolate performances calculated on a unit size solar cell to commercial products, especially in the case of heterogeneous wafers used for the device.
Magnetic Field Effect on the Electrical Parameters of a Polycrystalline Silicon Solar Cell
A. Dieng,N. Thiam,A. Thiam,A.S. Maiga
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study, we present a theoretical 3D study of a polycrystalline silicon solar cell in frequency modulation under polychromatic illumination and applied magnetic field. The influence of the applied magnetic field on the diode current density Jd, the both electric power-photovoltage and photocurrent-photovoltage characteristics are discussed. Nyquist diagram permitted to determine the electrical parameters such as series resistance Rs and parallel equivalent resistance Rp of a polycrystalline silicon solar cell. Bode diagram is then used to calculate the cut-off frequency, the capacitance C and inductance L. It has been shown that, under magnetic field, the solar cell behavior is like a low-pass filter.
Illumination Level Effects on Macroscopic Parameters of a Bifacial Solar Cell  [PDF]
Nzonzolo  , D. Lilonga-Boyenga, G. Sissoko
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.63004

This study presents a method based on the experimental measurement of the short-circuit current (Icc) and the open circuit voltage (Vco) of the solar cell. It permits the determination of recombination parameters such as: diffusion length (L), back surface recombination velocity (Sb), intrinsic junction recombination velocity (Sjo), and macroscopic parameters in particular, the shunt and series resistances of a bifacial solar cell for various illumination levels (n). Illumination level effects on macroscopic parameters are highlighted.

Solar photocatalitic degradation of Vat Yellow 4 dye in aqueous suspension of TiO2 - optimization of operational parameters  [PDF]
Sullipalayam K. Kavitha,Pachakoundanpalayam N. Palanisamy
Advances in Environmental Sciences , 2010,
Abstract: The photocatalytic decolourisation and degradation of an anthraquinone dye Vat Yellow 4 inaqueous solution with TiO2-P25 (Degussa) as photocatalyst in slurry form has been investigated undersolar irradiation and UV irradiation. The study on the effect of various photocatalysts on the degradationreveals that TiO2 is the best catalyst in comparison to other commercial photocatalysts. The effects ofvarious operational parameters such as catalyst loading, initial dye concentration and pH on thedecolourisation and degradation under solar irradiation in TiO2 suspension have been investigated to findout the optimum conditions. The decolourisation and degradation kinetics have been analysed. Bothfollow first-order kinetics. A study on the effect of electron acceptors on photo oxidation reveals thatboth decolourisation and degradation increase in the presence of the electron acceptors such as H2O2and (NH4)2S2O8 up to an optimum dosage beyond which the enhancement effect is negligible. Thecomparison between thin-film coating of TiO2 and aqueous slurry method reveals that slurry method ismore efficient.
Spatial Distribution of Radiation Belt Protons Deduced from Solar Cell Degradation of the Arase Satellite  [PDF]
Honoka Toda, Wataru Miyake, Yoshizumi Miyoshi, Hiroyuki Toyota, Yu Miyazawa, Iku Shinohara, Ayako Matsuoka
International Journal of Astronomy and Astrophysics (IJAA) , 2018, DOI: 10.4236/ijaa.2018.84022
Abstract: Analysis of solar-cell array panel (SAP) data from the Arase satellite orbiting in the inner magnetosphere showed a clear degradation of solar cells that could be attributed to trapped protons with energies greater than 6 MeV. Proton fluence was determined based on variations in the open-circuit voltage (Voc) of the solar cells, which we compared with that expected based on various distribution models (AP8MAX, AP9 mean and CRRESPRO quiet) of trapped protons. We found a general agreement, confirming the major contribution of trapped protons to the degradation, as well as a slight difference in the fluence expected based on the model calculations. To minimize this difference, we slightly modified the models, and found that concentrating the energetic protons on the magnetic equator provided a better agreement. Our results indicate that >6 MeV protons also has the equatorial concentration as reported for >18 MeV protons from the Van Allen Probes observation, and are interpreted as two components of the trapped protons, i.e., those of solar energetic particle (SEP) origin have an anisotropic pitch-angle distribution and are confined near the magnetic equator.
Solar Cell Parameters Extraction from a Current-Voltage Characteristic Using Genetic Algorithm  [PDF]
Journal of Nano- and Electronic Physics , 2013,
Abstract: The determination of solar cell parameters is very important for the evaluation of the cell performance as well as to extract maximum possible output power from the cell. In this paper, we propose a computational based binary-coded genetic algorithm (GA) to extract the parameters (I0, Iph and n) for a single diode model of solar cell from its current-voltage (I-V) characteristic. The algorithm was implemented using LabVIEW as a programming tool and validated by applying it to the I-V curve synthesized from the literature using reported values. The values of parameters obtained by GA are in good agreement with those of the reported values for silicon and plastic solar cells. change to “After the validation of the program, it was used to extract parameters for an experimental I-V characteristic of 4 × 4 cm2 polycrystalline silicon solar cell measured under 900 W/m. The I-V characteristic obtained using GA shows excellent match with the experimental one.
Surface Passivation and Antireflection Behavior of ALD on n-Type Silicon for Solar Cells  [PDF]
Ing-Song Yu,Yu-Wun Wang,Hsyi-En Cheng,Zu-Po Yang,Chun-Tin Lin
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/431614
Abstract: Atomic layer deposition, a method of excellent step coverage and conformal deposition, was used to deposit TiO2 thin films for the surface passivation and antireflection coating of silicon solar cells. TiO2 thin films deposited at different temperatures (200°C, 300°C, 400°C, and 500°C) on FZ n-type silicon wafers are in the thickness of 66.4?nm ± 1.1?nm and in the form of self-limiting growth. For the properties of surface passivation, Si surface is effectively passivated by the 200°C deposition TiO2 thin film. Its effective minority carrier lifetime, measured by the photoconductance decay method, is improved 133% at the injection level of ?cm?3. Depending on different deposition parameters and annealing processes, we can control the crystallinity of TiO2 and find low-temperature TiO2 phase (anatase) better passivation performance than the high-temperature one (rutile), which is consistent with the results of work function measured by Kelvin probe. In addition, TiO2 thin films on polished Si wafer serve as good ARC layers with refractive index between 2.13 and 2.44 at 632.8?nm. Weighted average reflectance at AM1.5G reduces more than half after the deposition of TiO2. Finally, surface passivation and antireflection properties of TiO2 are stable after the cofire process of conventional crystalline Si solar cells. 1. Introduction Most commercially available solar cells are from silicon, and p-type crystalline silicon solar cells are the mainstream now. In order to increase the efficiency of crystalline silicon solar cells, people in industry try to find the better integration processes of conventional solar cells, to improve the quality of materials, and to cost down the fabrication. Besides, new structures of silicon solar cells with higher efficiency are studied. Passivated emitter and rear, locally diffused cell (PERL), proposed by University of New South Wales, Australia, in 1994, is also one of the designs, which performs very high efficiency up to 25% [1]. In industry, the conversion efficiency of 6 inch × 6 inch p-type crystalline silicon solar cells can be over 20% using the surface passivation technology with Al2O3 thin films [2]. Unfortunately, the light induced degradation (LID) makes p-type crystalline silicon solar cells drop around 1% efficiency due to the formation of boron-oxygen clusters after light exposure [3]. Therefore, PERL with n-type silicon wafers attracts researchers’ great attention recently and will dominate the crystalline Si solar cell in the near future [4, 5]. For the surface passivation and antireflection coating of p-type
Construction of Tungsten Halogen, Pulsed LED, and Combined Tungsten Halogen-LED Solar Simulators for Solar Cell - Characterization and Electrical Parameters Determination
Anon Namin,Chaya Jivacate,Dhirayut Chenvidhya,Krissanapong Kirtikara,Jutturit Thongpron
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/527820
Abstract: - characterization of solar cells is generally done under natural sunlight or solar simulators operating in either a continuous mode or a pulse mode. Simulators are classified on three features of irradiance, namely, spectral match with respect to air mass 1.5, spatial uniformity, and temporal stability. Commercial solar simulators use Xenon lamps and halogen lamps, whereas LED-based solar simulators are being developed. In this work, we build and test seven simulators for solar cell characterization, namely, one tungsten halogen simulator, four monochromatic (red, green, blue, and white) LED simulators, one multicolor LED simulator, and one tungsten halogen-blue LED simulator. The seven simulators provide testing at nonstandard test condition. High irradiance from simulators is obtained by employing elevated supply voltage to tungsten halogen lamps and high pulsing voltages to LEDs. This new approach leads to higher irradiance not previously obtained from tungsten halogen lamps and LEDs. From - curves, electrical parameters of solar cell are made and corrected based on methods recommended in the IEC 60891 Standards. Corrected values obtained from non-STC measurements are in good agreement with those obtained from Class AAA solar simulator.
Optimization of Electrics Parameters CdS/CdTe Thin Film Solar Cell Using Dielectric Model  [PDF]
Oumar Absatou Niasse, Mahamadou Abdou Tankari, Fatou Dia, Nacire Mbengue, Amadou Diao, Mamadou Niane, Moulaye Diagne, Bassirou Ba, Gilles Levebvre
World Journal of Condensed Matter Physics (WJCMP) , 2016, DOI: 10.4236/wjcmp.2016.62011
Abstract: Abstract *Corresponding author. In this paper, the electrical properties of heterojunction solar cells thin film n-CdS/p-CdTe from dielectric model have been studied. Based on the expression of the minority, carriers density in the p-CdTe base of solar cell, the photocurrent density and that of the photo voltage are determined according to the cell dimensions, doping levels, the absorption coefficient, the solar irradiance and the temperature, etc. Fitting using Mathcad and Origin Lab software on the photocurrent and the photovoltage of the n-CdS/p-CdTe enabled to determine the series, shunt resistance and the maximum power point. The results obtained, in good agreement with experimental results, allow operating simulations for optimizing maximum outputs parameters (Ip, Vp). Thereafter, it is proposed a type of photovoltaic generator module with a good command of the design parameters for better efficiency.
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