Two-step sequentially deposited FAPbI₃ polycrystalline film is adopted to produce high-performance perovskite solar cells (PSCs) with outstanding power conversion efficiency (PCE). The pore-forming of the inorganic film is beneficial to the second organic salt infiltrate, thus promoting a solid-solution reaction. Here, lead chloride (PbCl₂) is introduced into lead iodide (PbI₂) precursor solution to adjust the properties of PbI₂ membranes and obtain a micrometer-sized perovskite layer by reducing grain boundary defects. The incorporation of PbCl₂ reduces bulk defects and improves the device's performance. The PSCs displayed good operational stability in the dry atmosphere over 2 months. The PCE of PSCs exhibited an increased trend in the initial measurement and then showed decreased trend. A champion PCE of 22.07% was obtained after storage. Furthermore, the PL/TRPL of perovskite film and perovskite/Spiro-OMeTAD interface was tested to explain the efficiency evolution. This work may provide a strategy for further improving the performance of PSCs via fine-controlled PbI₂ membranes in the perovskite layer.

采用两步顺序沉积FAPbI ₃多晶薄膜来生产具有出色功率转换效率（PCE）的高性能钙钛矿太阳能电池（PSC）。无机膜的成孔有利于有机盐的二次渗透，从而促进固溶反应。在此，将氯化铅（PbCl ₂）引入到碘化铅（PbI _{2 ）前体溶液中以调节PbI 2}膜的性能并通过减少晶界缺陷获得微米尺寸的钙钛矿层。_{PbCl 2}的加入减少了体缺陷并提高了器件的性能。PSC 在干燥大气中超过 2 个月表现出良好的运行稳定性。PSCs的PCE在初始测量中呈现增加趋势，然后呈现下降趋势。存储后获得了22.07%的冠军PCE。此外，还测试了钙钛矿薄膜和钙钛矿/Spiro-OMeTAD 界面的 PL/TRPL，以解释效率演变。这项工作可能为通过钙钛矿层中的精细控制 PbI ₂膜进一步提高 PSC 的性能提供策略。