Performance Improvement of Inorganic Lead-Free Perovskite Solar Cell

This paper simulates the lead-free or non-toxic PSC (perovskite solar cell) based on cesium tin germanium halide (CsSnGeI3). The effect of different electron transport layers is understood by mutually related the built-in potential (Vbi) with the open circuit voltage (VOC). The simulation study reveals that electron transport layer (ETL) shows a crucial effect on the photovoltaic performance (PV performance) of solar cell. It is obtained from simulation, that ZnOS (Zincoxysulfide) as an ETL shows better device efficiency. Further, the PV performance is optimized based on the defect density (DD) of perovskite absorber layer. The proposed work depicts that at the optimum defect density of 1 × 1014 cm−3 a remarkable device efficiency is achieved i.e., ~ 25.43%.