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Methylamine‐Gas‐Induced Defect‐Healing Behavior of CH 3 NH 3 PbI 3 Thin Films for Perovskite Solar Cells
Author(s) -
Zhou Zhongmin,
Wang Zaiwei,
Zhou Yuanyuan,
Pang Shuping,
Wang Dong,
Xu Hongxia,
Liu Zhihong,
Padture Nitin P.,
Cui Guanglei
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201504379
Subject(s) - methylamine , perovskite (structure) , thin film , materials science , chemical engineering , chemistry , nanotechnology , crystallography , organic chemistry , engineering
We report herein the discovery of methylamine (CH 3 NH 2 ) induced defect‐healing (MIDH) of CH 3 NH 3 PbI 3 perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with CH 3 NH 2 gas at room temperature. The key to this healing behavior is the formation and spreading of an intermediate CH 3 NH 3 PbI 3 ⋅ x CH 3 NH 2 liquid phase during this unusual perovskite–gas interaction. We demonstrate the versatility and scalability of the MIDH process, and show dramatic enhancement in the performance of perovskite solar cells (PSCs) with MIDH. This study represents a new direction in the formation of defect‐free films of hybrid perovskites.