Over 32% Efficient All‐Inorganic Two‐Terminal CsPbI ₂ Br/Si Tandem Solar Cells: A Numerical Investigation

Cesium-based all-inorganic CsPbI2Br perovskite solar cells (PSCs) offer excellent thermal stability and an optimum bandgap for photovoltaic applications, making them promising alternatives to the thermally unstable organic–inorganic metal halide perovskites. State-of-the-art single-junction PSCs are yet achieve high power conversion efficiency (PCE) of hybrid counterparts. Herein, numerical simulations, through cell capacitance simulator-1D (SCAPS-1D), demonstrate a highly efficient two-terminal tandem (TSC), with silicon heterojunction (a-Si:H/c-Si) as top bottom subcells, respectively, used. The standalone subcells first calibrated match experimental results reported in literature, followed by evaluation configuration. With 0.5 μm-thick cell, c-Si thickness is adjusted subcell currents, boosting PCE 26.25%. TSC can be further improved, carefully selecting electron hole transport layers PSC tuning work function front-contact electrode. Under optimized current-matched conditions, proposed design shows 32.44%, enabling pathway perovskite/silicon tandems.