Facile healing of cracks in organic-inorganic halide perovskite thin films

被引：69
作者：
Yadavalli, Srinivas K. [1 ]
Dai, Zhenghong [1 ]
Zhou, Hua [2 ]
Zhou, Yuanyuan [1 ]
Padture, Nitin P. [1 ]
机构：
[1] Brown Univ, Sch Engn, Providence, RI 02912 USA
[2] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA
来源：
ACTA MATERIALIA | 2020年 / 187卷
基金：
美国国家科学基金会;
关键词：
Halide perovskite; Thin film; Crack healing; X-ray diffraction; Scanning electron microscopy; ION CONDUCTION; LEAD-IODIDE; TRIHALIDE; BEHAVIOR; LIGHT;
D O I：
10.1016/j.actamat.2020.01.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Organic-inorganic halide perovskite (OIHP) thin films at the heart of the burgeoning thin-film perovskite solar cells (PSCs) technology possess poor mechanical properties, which is likely to limit the long-term reliability of PSCs as they are poised for commercialization. In an effort to address this issue, here we demonstrate that through-thickness cracks induced by bending-tension in thin films of the two prototypical OlHPs, methylammonium lead triiodide (MAPbl(3)) and formamidinium lead triiodide (FAPbl(3)), can be healed easily. This is through the application of either a moderate compressive stress (bending-compression) at room temperature or a simple heat-treatment at modest temperatures. The crack-healing process is found to be time-dependent, which indicates that facile mass-transport in OlHPs plays a key role in this phenomenon. An explanation for this phenomenon is provided, one based on the fundamentals of brittle fracture. This discovery has broad implications for the prevention and/or restoration of the overall performance, environmental stability, and mechanical reliability of PSCs, and other devices. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：112 / 121
页数：10
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