Optimization and Performance Analysis of a TiO₂/i-CH₃NH₃SnBr₃/CsPbI₃/Al(BSF) Heterojunction Perovskite Solar Cell for Enhanced Efficiency

Abstract

This paper reports the simulation and optimization of heterojunction perovskite solar cells (PSCs) with a proposed structure of TiO2/i-CH3NH3SnBr3/CsPbI3/Al­(BSF) using SCAPS-1D software. The purpose of this study is to investigate the performance of the PSC with CsPbI3 perovskite active layers and i-CH3NH3SnBr3 as the permeable layer. Therefore, the thicknesses of the layers of the heterojunction perovskite are modified in order to find a better conversion efficiency of the solar cell, where the latter’s performance is improved by optimizing the absorber’s thickness, which is found to be 1 μm, with a permeable layer of 15 μm. The device efficiency of the i-CH3NH3SnBr3/CsPbI3 heterojunction is improved to 38.98%, and optimized parameters are V oc = 1.21 mV, J sc = 35.63 mA/cm2, and FF = 89.84%. The acceptor concentration (N a), donor concentration (N d), defect density, and series and shunt resistances are also investigated.