Comprehensive study of highly efficient Rb₂AgInX₆ (X = Cl, Br, I) based lead-free double perovskite solar cells

Abstract Lead-free Double Perovskite Solar Cells (DPSCs) have generated great study interest recently as a potential perovskite absorber layer, due to their cost-effectiveness, impressive stability, and superior performance. In this study, we investigated Rb 2 AgInX 6 (Cl, Br, I) based DPSCs using SCAPS-1D simulation software. Various properties, such as the density of states for conduction and valance bands, carrier concentration, and carrier mobility (electrons and holes), were calculated for simulation. Furthermore, we have optimized defect density, electron affinity, and thickness of absorber layers for Rb 2 AgInX 6 -based DPSCs. We investigated how DPSC parameters were impacted by operating temperature and then performed band gap tuning for Rb 2 AgInBr 6 -based DPSC along with their temperature stability. Tandem solar cells (TSC) have had an enormous influence on the field of photovoltaics (PV) because of their ability to effectively use a wider range of solar spectrum and reduce unwanted energy loss. In this context, we have simulated Rb 2 AgInBr 6 /Rb 2 AgInI 6 based an all double perovskite tandem solar cells and optimized the same for future experimental applications. The optimized PCE of 12.14%, 26.49%, and 13.95% were obtained for Rb 2 AgInX 6 (X = Cl, Br, I respectively) based DPSCs. In comparison, the PCE of 38.70% was obtained for tandem structure.