Numerical Analysis of High‐Efficiency Chalcogenide Perovskite Solar Cells (InBiSe₃/GaBiSe₃): Study of Single and Bilayer Configurations

Chalcogenide perovskites are emerging as a promising alternative to hybrid halide perovskites for optoelectronic applications, owing to their excellent light absorption and chemical stability. This study investigates the performance of single‐ and dual‐absorber solar cell devices using InBiSe 3 and GaBiSe 3 as absorber materials, simulated using the solar cell capacitance simulator in one dimension software. The devices employ WS 2 as the electron transport layer and CuO as the hole transport layer. For single‐absorber devices, GaBiSe 3 achieve a power conversion efficiency (PCE) of 26.58%, with a V OC of 0.94 V, a fill factor (FF) of 86.82%, and a short‐circuit current density ( J SC ) of 32.52 mA cm − 2 . InBiSe 3 performs slightly lower, with a PCE of 21.44%, V OC of 1.25 V, FF of 87.83%, and J SC of 19.49 mA cm − 2 . The bilayer configuration, incorporating InBiSe 3 as the top layer and GaBiSe 3 as the bottom layer, shows the highest efficiency of 30%, with a V OC of 1.06 V, J SC of 32.78 mA cm − 2 , and FF of 85.97%. The study also examines the effects of temperature, shunt resistance, and series resistance on the device performance, as well as the influence of absorber layer thickness, defect density, and back contact variations.