The black perovskite (α-FAPbI₃) tends to spontaneously transform into the yellow non-perovskite (δ-FAPbI₃) under ambient conditions, which degrades the performance and stability of FAPbI₃-based perovskite solar cells (PSCs). Herein, we applied an in-situ polymerization controlled growth (IPCG) strategy for crystal grain to suppress the α-to-δ phase conversion. Polymerization of 2-(Dimethylamino) ethyl methacrylate (DMAEMA) contained in the antisolvent created polymers (denoted as Poly(D)) which acted to simultaneously increase the perovskite grain size, passivate defects, stabilize the black phase, and block moisture penetration, thus greatly improving photovoltaic performance and stability. The resulting FAPbI₃-based PSC (FTO/SnO₂/Perovskite/Spiro-OMeTAD/Au) delivered a high power conversion efficiency (PCE) of ~ 21% (cf. ~ 16.0% PCE for the pristine FAPbI₃ device). Further, the polymerization strategy delivers PSCs with remarkable stability, with 100% of the initial PCE performance being retained over 104 days under ambient conditions (room temperature, RH = 50 ± 5%) without encapsulation of the device.

黑色钙钛矿（α -FAPbI ₃）倾向于自发地转变成黄色非-perovskite（δ -FAPbI ₃）在环境条件下，这会降低FAPbI的性能和稳定性₃为基础的钙钛矿太阳能电池（的PSC）。在这里，我们应用了原位晶粒的聚合控制生长（IPCG）策略可抑制α到δ相的转化。反溶剂生成的聚合物（称为Poly（D））中所含的甲基丙烯酸2-（二甲基氨基）乙酯（DMAEMA）的聚合作用可同时增加钙钛矿的晶粒尺寸，钝化缺陷，稳定黑相并阻止湿气渗透，因此大大提高了光伏性能和稳定性。所得的基于FAPbI ₃的PSC（FTO / SnO ₂ /钙钛矿/ Spiro-OMeTAD / Au）的原始功率FAPbI _3的功率转换效率（PCE）为〜21％（参见〜16.0％PCE）。设备）。此外，聚合策略可提供具有出色稳定性的PSC，在环境条件（室温，RH = 50±5％）下，在104天之内可以保持100％的初始PCE性能，而无需封装设备。