材料科学
结晶度
异质结
钝化
再结晶(地质)
光电子学
钙钛矿(结构)
钙钛矿太阳能电池
晶界
能量转换效率
化学工程
纳米技术
图层(电子)
复合材料
微观结构
古生物学
工程类
生物
作者
Hua Dong,Zhaoxin Wu,Jun Xi,Xiaobao Xu,Lijian Zuo,Ting Lei,Xingang Zhao,Lijun Zhang,Xun Hou,Alex K.‐Y. Jen
标识
DOI:10.1002/adfm.201704836
摘要
Abstract High crystallinity and compactness of the active layer is essential for metal‐halide perovskite solar cells. Here, a simple pseudohalide‐induced film retreatment technology is developed as the passivation for preformed perovskite film. It is found that the retreatment process yields a controllable decomposition‐to‐recrystallization evolution of the perovskite film. Corresponding, it remarkably enlarges the grain size of the film in all directions, as well as improving the crystallinity and hindering the trap density. Meanwhile, owing to an intermediate catalytic effect of the pseudohalide compound (NH 4 SCN), no crystal orientation changing and no impurity introduction in the modified film. By integrating the modified perovskite film into the planar heterojunction solar cells, a champion power conversion efficiency of 19.44% with a stabilized output efficiency of 19.02% under 1 sun illumination is obtained, exhibiting a negligible current density–voltage hysteresis. Moreover, such a facile and low‐temperature film retreatment approach guarantees the application in flexible devices, showing a best power conversion efficiency of 17.04%.
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