Acetonitrile-Based Antisolvent Strategy for Performance Enhancement of CsPbBr₃ Perovskite Solar Cells

Inorganic CsPbBr₃ perovskite has garnered significant research interest owing to its exceptional stability under harsh humid conditions; however, the power conversion efficiency (PCE) of CsPbBr₃-based perovskite solar cells (PSCs) remains lower than that of their hybrid counterparts. Antisolvent-assisted crystallization is a robust strategy for fabricating high-quality perovskite films for high-performance PSCs. In this study, high-quality CsPbBr₃ perovskite films were prepared by incorporating an optimized concentration of acetonitrile (ACN) into the PbBr₂ precursor solution under ambient air conditions. The resulting CsPbBr₃ perovskite layer exhibited enlarged grain size, reduced surface defect density, and enhanced charge-carrier transport properties. Consequently, carbon-based, hole transport layer-free CsPbBr₃ PSCs achieved a PCE increase from 2.63% to 6.69%. This research presents an effective antisolvent engineering strategy for high-quality film fabrication and offers valuable insights for advancing the commercial viability of PSCs.