Organic-inorganic hybrid perovskite solar cells (PSCs) have developed rapidly in recent years, and the instability limits its commercialization. Non-radiative recombination caused by defects and water stability affect the device stability. Here we introduce an organic silane additive, tetramethoxysilane (TMOS), which can reduce the non-radiative recombination and prevent the water erosion. The methoxy group in TMOS can combine with Pb²⁺ of perovskite to passivate undercoordinated Pb²⁺ defects and reduce non-radiative recombination. Under a certain humidity, the hydrolyzed product SiO₂ can occupy the grain boundary sites to prevent the erosion of water molecules, slow down the degradation of perovskite, and improve the crystal phase stability of perovskite. The PCE of the device increases from 17.13% to 20.12%. After 400 h at 50% relative humidity (RH), the PSC with 2% TMOS can maintain the efficiency of 90%, while the efficiency of the control group quickly dropped to only 70% of the initial.

有机-无机杂化钙钛矿太阳能电池（PSCs）近年来发展迅速，但其不稳定性限制了其商业化。缺陷引起的非辐射复合和水稳定性影响器件稳定性。这里我们介绍一种有机硅烷添加剂四甲氧基硅烷 (TMOS)，它可以减少非辐射复合并防止水侵蚀。TMOS中的甲氧基可以与钙钛矿的Pb ²⁺结合，钝化欠配位的Pb ²⁺缺陷，减少非辐射复合。在一定湿度下，水解产物SiO ₂可以占据晶界位点，防止水分子的侵蚀，减缓钙钛矿的降解，提高钙钛矿的晶相稳定性。设备的 PCE 从 17.13% 增加到 20.12%。在 50% 相对湿度 (RH) 下 400 h 后，含 2% TMOS 的 PSC 可以保持 90% 的效率，而对照组的效率迅速下降到只有初始的 70%。