Introducing a Sustainable Novel Double Absorber Perovskite Solar Cell Using CsSnI ₃ and La ₂ NiMnO ₆ : A Strategy to Achieve 32.73% Efficiency

This study focuses on improving device performance by introducing an innovative double perovskite active layer (DPAL). The proposed design incorporates a DPAL made of CsSnI 3 and La 2 NiMnO 6 (LNMO), combined with a tungsten disulfide (WS 2 ) electron transport layer (ETL). Using the Solar Cell Capacitance Simulator Structures (SCAPS‐1D) software tool, a novel double absorber solar cell was computationally analyzed. Comparative results show that the DPAL‐based perovskite solar cell (PSC) outperforms single active layer PSCs. The study also investigates how factors, such as active layer thickness, defect density, and interface defects affect performance, along with the influence of temperature and doping density on efficiency. The proposed design achieves a power conversion efficiency (PCE) of 32.73%, with a short‐circuit current density ( J SC ) of 36.51 mA/cm 2 , an open‐circuit voltage ( V OC ) of 1.05 V, and a fill factor (FF) of 85.28%. In comparison, single absorber designs based on LNMO and CsSnI 3 yield PCEs of 20.26% and 30.57%, respectively. This DPAL‐based solar cell shows great potential for advancing highly efficient PSC development in the future.