Browsing by Author "Chala, Slimane"

Filter results by typing the first few letters
Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    Dependence of structural and optical properties of ZnO thin films grown by Sol–Gel Spin-Coating technique on solution molarity
    (Springer, 2022) Chala, Slimane; Bdirina, Madani; Elba, Mourad; Naoui, Yassine; Benbouzid, Yazid; Taouririt, Taki Eddine; Labed, Mohamed; Boumaraf, Rami; Bouhdjar, Abdel Fodhil; Sengouga, Nouredine; Yakuphanoğlu, Fahrettin; Rahmane, Saâd
    Zinc oxide (ZnO) thin films were deposited on glass substrates by using sol–gel spin coating technique. Zinc acetate dihy- drate and 2-methoxyethanol were used as precursor with different molar concentrations, 0.2 M, 0.3 M and 0.6 M. The effect of precursor concentration on the structural and optical properties, transmission (T), reflection (R), optical bandgap (Eg), Urbach energy (E U ), refractive index (n), extinction coefficient (k), single-oscillator energy (E 0 ), dispersion energy (E d ), moments M −1 and M −3 , dielectric constant (ε) and optical conductivity (σ), of the ZnO thin films was studied and investi- gated. Although, the transmittance, slightly, decreased and the reflectance increased, as the molar concentration increased, the measurements showed that all samples have high transparency and low reflectivity in the visible range which make them suitable for solar cells applications. It is also found that, as the molarity increased, the ZnO thin films exhibited lower Eg and E U and higher Ed, M −1 and M −3
  • No Thumbnail Available
    Item
    Effect of temperature on the performance of CGS/CIGS tandem solar cell
    (2023) Elbar, Mourad; Tobbeche, Souad; Chala, Slimane; Saidani, Okba; Kateb, Mohamed Nadjib; Serdouk, Mohamed Redha
    The CGS and CIGS being promising materials for large scale photovoltaic applications, the effect of temperature on the electrical parameters of a CGS/CIGS tandem solar cell has been investigated in this work. The copper gallium diselenide (CGS) and copper indium gallium diselenide (CIGS) structures as topcell and bottom-cell respectively, were numerically simulated under AM1.5G spectral illumination using the two-dimensional device simulator Silvaco-Atlas. The temperature dependency of the solar cell’s characteristics was investigated in the temperature range from 300 to 400 K at intervals of 20 K. The simulation results show the density current (Jsc) slightly increases whereas the open-circuit voltage (Voc) and fill factor (FF), conversion efficiency () decreases with the increase in temperature. The tandem cell operating temperature efficiency was found to be (– 0.34 %/K), which is slightly higher than that of CGS solar cell (– 0.29 %/K), but markedly better than that of CIGS solar cell (– 0.41 %/K)
  • No Thumbnail Available
    Item
    Effect of Temperature on the Performance of CGS/CIGS Tandem Solar Cell
    (Sumy State University, 2023) Elbar, Mourad; Tobbeche, Souad; Chala, Slimane; Saidani, Okba; Kateb, Mohamed Nadjib; Redha Serdouk, Mohamed
    The CGS and CIGS being promising materials for large scale photovoltaic applications, the effect of temperature on the electrical parameters of a CGS/CIGS tandem solar cell has been investigated in this work. The copper gallium diselenide (CGS) and copper indium gallium diselenide (CIGS) structures as topcell and bottom-cell respectively, were numerically simulated under AM1.5G spectral illumination using the two-dimensional device simulator Silvaco-Atlas. The temperature dependency of the solar cell’s characteristics was investigated in the temperature range from 300 to 400 K at intervals of 20 K. The simulation results show the density current (Jsc) slightly increases whereas the open-circuit voltage (Voc) and fill factor (FF), conversion efficiency (ƞ) decreases with the increase in temperature. The tandem cell operating temperature efficiency was found to be (– 0.34 %/K), which is slightly higher than that of CGS solar cell (– 0.29 %/K), but markedly better than that of CIGS solar cell (– 0.41 %/K).
  • No Thumbnail Available
    Item
    Simulation study of CZTS/CZTSe tandem solar cell by using SCAPS-1D software
    (Sumy State University, 2022) Ghalmi, Leila; Bensmaine, Souhila; Elbar, Mourad; Chala, Slimane; Merzouk, Hayat
    The solar spectrum can be divided by tandem solar cells into several subcells that have different bandgaps which convert, more effectively, the light into electricity than the single cells. In this study, the simulation of the photovoltaic (PV) characteristics of a CZTS/CZTSe tandem solar cell, based on structures of copper zinc tin sulfide (CZTS) as a top cell and copper zinc tin selenide (CZTSe) as a bottom cell, was accomplished by using SCAPS-1D simulator under AM1.5 illumination. Initially, the simulation of single CZTS and CZTSe solar cells was performed to give efficiency of 14.37 % and 17.87 %, respectively, which are in good agreement with the literature results. Before feeding with filtered spectrum, the simulated PV parameters of the CZTS/CZTSe tandem solar cell are the conversion efficiency (η) of 20.68 % and the shortcircuit current density (Jsc) of 20.205 mA/cm2 of the top and bottom cells with arbitrary normal thicknesses. Furthermore, and in order to reach the matching current, both top and bottom cells have been investigated at different thicknesses for tandem configuration after validation, where the performance of the top and bottom cells is at thicknesses ranged from 0.05-0.5 μm and 0.1-1 μm, respectively. The performance of the tandem solar cell is determined after filtered spectrum feeding and current matching. The Jsc of CZTS/CZTSe tandem solar cell is 20.33 mA/cm2 for 0.255 μm thick of the top, CZTS, cell and 0.8 μm of the bottom, CZTSe, cell. The maximum η of 22.98 % is reached for tandem structure design with open circuit voltage (Voc) enhancing of 1.48 V