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Thin‐Film Transformation of NH 4 PbI 3 to CH 3 NH 3 PbI 3 Perovskite: A Methylamine‐Induced Conversion–Healing Process
Author(s) -
Zong Yingxia,
Zhou Yuanyuan,
Ju Minggang,
Garces Hector F.,
Krause Amanda R.,
Ji Fuxiang,
Cui Guanglei,
Zeng Xiao Cheng,
Padture Nitin P.,
Pang Shuping
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201609529
Subject(s) - methylamine , perovskite (structure) , thin film , materials science , crystallite , chemical engineering , phase (matter) , crystallography , nanotechnology , metallurgy , chemistry , organic chemistry , engineering
Methylamine‐induced thin‐film transformation at room‐temperature is discovered, where a porous, rough, polycrystalline NH 4 PbI 3 non‐perovskite thin film converts stepwise into a dense, ultrasmooth, textured CH 3 NH 3 PbI 3 perovskite thin film. Owing to the beneficial phase/structural development of the thin film, its photovoltaic properties undergo dramatic enhancement during this NH 4 PbI 3 ‐to‐CH 3 NH 3 PbI 3 transformation process. The chemical origins of this transformation are studied at various length scales.