Abstract
A novel multi-junction CGS/CIGS solar cell is proposed in this paper. Two p-n junctions of the presented solar cell are copper gallium diselenide (CGS) and copper indium gallium diselenide (CIGS). Three anti-reflector coating layers are embedded at the top of the structure. The anti-reflector layers are cadmium sulfide (CdS), zinc telluride (ZnTe), and zinc oxide (ZnO), respectively. These layers are optimized so that the short-circuit currents of the sub-cells be equal. The optimization method is performed by adjusting the structural and physical parameters of the layers so that the conversion efficiency is increased. The open-circuit voltage (Voc) equal to 2.14 volt, short-circuit current density (Jsc) of 25.1735 mA/cm2, fill factor (FF) of 86.88%, and conversion efficiency of 46.802% are obtained by designed solar cell. Moreover, the output characteristics of the designed structure are extracted by considering the temperature variations. Finally, the Jsc of the cell is improved by about 2.5907 mA/cm2 after adding an Aluminium back mirror layer at the bottom surface. An optimized efficiency of 47.437% is achieved using this method.
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