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Pseudohalide‐Induced Recrystallization Engineering for CH 3 NH 3 PbI 3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells
Author(s) -
Dong Hua,
Wu Zhaoxin,
Xi Jun,
Xu Xiaobao,
Zuo Lijian,
Lei Ting,
Zhao Xingang,
Zhang Lijun,
Hou Xun,
Jen Alex K.Y.
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201704836
Subject(s) - materials science , crystallinity , energy conversion efficiency , perovskite (structure) , heterojunction , passivation , recrystallization (geology) , optoelectronics , perovskite solar cell , grain boundary , chemical engineering , nanotechnology , layer (electronics) , composite material , microstructure , paleontology , biology , engineering
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%.