Pure α-phase (FAPbI3)0.83(MAPbBr3)0.17 powder for efficient perovskite solar cells with enhancing reproducibility

Commercializing perovskite solar cells (PSCs) necessitates achieving high performance and reproducibility. One effective strategy for this is the precise regulation of raw powder components in the precursor solution to create high-quality perovskite films. In this study, explored the impact of various precursor solutions on the crystallinity and photovoltaic performance of α-phase (FAPbI)(MAPbBr) perovskite systems. A synthesis method utilizing a mixed powder (FAPbI)(MAPbBr), designated as P2, was developed to address reproducibility issues in PSCs arising from unbalanced stoichiometric ratios. The resulting P2-based perovskite film exhibited large grain size and minimal defects, leading to PSCs with an impressive power conversion efficiency (PCE) of 21.36 % and an open-circuit voltage () of 1.142 V. Encouragingly, the P2-based PSCs demonstrated outstanding reproducibility and storage stability, with PCE decay limited to 2.1 % at room temperature over a 21-day period.