Design and Simulation of a Novel All-Inorganic CZTSSe/ZnSnN 2 Dual-Absorber Solar Cell Achieving 31.52% Efficiency

The development of environmentally friendly perovskite-based solar cells requires researchers to solve several difficult challenges which need to be addressed for efficient and stable device creation. This study presents a novel all-inorganic dual-absorber solar cell structure with power conversion efficiency (PCE) exceeding 31%. The proposed configuration is optimized through the SCAPS-1D simulation platform, emphasizing the optical synergy of two absorber layers. It integrates a narrow-bandgap perovskite material- CZTSSe, as top absorber with a wide-bandgap ZnSnN2bottom absorber. The studied device architecture - FTO/ZnO/CZTSSe/ZnSnN2/NiOx/Au, theoretically achieved an open circuit voltage Voc= 0.8915 V, short circuit current density Jsc= 42.18 mA/cm2, fill factor (FF) = 83.75%. The materials required to build this solar cell are composed of non-toxic and earth-abundant substances. Moreover, being all inorganic, the prospective device has better longevity. Therefore, this work confirms the viability of sustainable materials for next-generation high-efficiency photovoltaic devices with enhanced photo-conversion performance.