An organic molecule, 2-Fluoro-4-iodoaniline (FID), is adopted to passivate the surface defects of (FAPbI₃)_0.95(MAPbBr₃)_0.05 perovskite films. The amino group of FID forms a coordinate bond with the uncoordinated lead ion on the perovskite surface via Lewis acid–base interaction, which significantly reduced the defect state density, suppressed carrier nonradiative recombination, and boosted carrier transport of the perovskite films, resulting in increased open circuit voltage (V_oc) and fill factor (FF) of the perovskite solar cells (PSCs). Meanwhile, fluorine group of FID forms hydrogen bond with perovskite, restraining ions moving and decomposition of perovskite. Consequently, the power conversion efficiency (PCE) of the PSCs was increased from 21.07% to 23.44%. Moreover, FID passivation also improved the ambient stability of the PSCs. The unencapsulated PSC with FID passivation retained more than 90% of its initial PCE for over 1500 h of storage under ambient conditions.

采用有机分子 2-Fluoro-4-iodoaniline (FID) 钝化 (FAPbI ₃ ) _0.95 (MAPbBr ₃ ) _0.05钙钛矿薄膜的表面缺陷。FID的氨基通过路易斯酸碱相互作用与钙钛矿表面未配位的铅离子形成配位键，显着降低缺陷态密度，抑制载流子非辐射复合，促进钙钛矿薄膜的载流子传输，从而增加开路电压 ( V _oc) 和钙钛矿太阳能电池 (PSC) 的填充因子 (FF)。同时，FID的氟基团与钙钛矿形成氢键，抑制离子移动和钙钛矿的分解。因此，PSC 的功率转换效率 (PCE) 从 21.07% 提高到 23.44%。此外，FID 钝化还提高了 PSC 的环境稳定性。具有 FID 钝化的未封装 PSC 在环境条件下可保留超过 90% 的初始 PCE，存储时间超过 1500 小时。