The Solar Cell Performance Parameters of CuI as a Hole Transport Layer Were Analyzed by SCAPS-1D

Kesterite materials such as CZTS are widely found in nature and have the advantages of nontoxicity, high absorption coefficient, direct bandgap, etc. These characteristics are conducive to the production of solar cells. Solar technology has seen some success in recent years, but there is still a big gap between the actual conversion efficiency and the ideal conversion efficiency, and the main problem lies in the defects of the CZTS layer and CdS/CZTS interface layer. Copper iodide (CuI) has better photovoltaic characteristics, which can be used as a potential solution to this problem. Therefore, different from traditional solar cells, a CuI layer is added as a hole transport layer (HTL), and the SCAPS-1D program is used for simulation. Adjust the thickness of the CZTS layer and CuI layer, defect density of the CZTS layer and defect density of the CdS/CZTS interface layer, and other different variables to optimize the Cu/AZO/i-ZnO/CdS/CZTS/CuI/Au structure. The battery structure was optimized through power conversion efficiency (PCE), short-circuit current (J_SC), open-circuit voltage (V_OC), and filling factor (FF), and the efficiency was finally increased to 21.26%.