甲脒
加合物
化学
路易斯酸
钙钛矿(结构)
基础(拓扑)
化学工程
有机化学
催化作用
数学
工程类
数学分析
作者
Jin Wook Lee,Zhenghong Dai,Changsoo Lee,Hyuck Mo Lee,Tae Hee Han,Nicholas De Marco,Oliver Lin,Christopher Choi,Bruce Dunn,Jaekyung Koh,Jeong Hoon Ko,Heather D. Maynard,Yang Yang
摘要
The Lewis acid-base adduct approach has been widely used to form uniform perovskite films, which has provided a methodological base for the development of high-performance perovskite solar cells. However, its incompatibility with formamidinium (FA)-based perovskites has impeded further enhancement of photovoltaic performance and stability. Here, we report an efficient and reproducible method to fabricate highly uniform FAPbI3 films via the adduct approach. Replacement of the typical Lewis base dimethyl sulfoxide (DMSO) with N-methyl-2-pyrrolidone (NMP) enabled the formation of a stable intermediate adduct phase, which can be converted into a uniform and pinhole-free FAPbI3 film. Infrared and computational analyses revealed a stronger interaction between NMP with the FA cation than DMSO, which facilitates the formation of a stable FAI·PbI2·NMP adduct. On the basis of the molecular interactions with different Lewis bases, we proposed criteria for selecting the Lewis bases. Owed to the high film quality, perovskite solar cells with the highest PCE over 20% (stabilized PCE of 19.34%) and average PCE of 18.83 ± 0.73% were demonstrated.
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