钝化
材料科学
卤化物
钙钛矿(结构)
水分
路易斯酸
降级(电信)
化学工程
相(物质)
相对湿度
太阳能电池
能量转换效率
无机化学
图层(电子)
纳米技术
光电子学
催化作用
化学
复合材料
有机化学
电子工程
热力学
工程类
物理
作者
Zhi Yang,Jinjuan Dou,Song Kou,Jialin Dang,Yongqiang Ji,Guan‐Jun Yang,Wu‐Qiang Wu,Dai‐Bin Kuang,Xiaogang Wang
标识
DOI:10.1002/adfm.201910710
摘要
Abstract Multiple‐cation lead mixed‐halide perovskites (MLMPs) have been recognized as ideal candidates in perovskite solar cells in terms of high efficiency and stability due to decreased open‐circuit voltage loss and suppressed yellow phase formation. However, they still suffer from an unsatisfactory long‐term moisture stability. In this study, phosphorus‐containing Lewis acid and base molecules are employed to improve device efficiency and stability based on their multifunction including recombination reduction, phase segregation suppression, and moisture resistance. The strong fluorine‐containing Lewis acid treatment can achieve a champion PCE of 22.02%. Unencapsulated and encapsulated devices retain 63% and 80% of the initial efficiency after 14 days of aging under 75% and 85% relative humidity, respectively. The better passivation of Lewis acid implies more halide defects than Pb defects at the MLMP surface. This unbalanced defect type results from phase segregation that is the synergistic effect of Cs and halide ion migrations. Identifying defect type based on different passivation effects is beneficial to not only choose suitable passivators to boost the efficiency and slow down the moisture degradation of MLMP solar cells, but also to understand the mechanism of defect‐assisted moisture degradation.
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