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DOI	10.1039/c6ee02941h
	Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films
	Wang Q.; Chen B.; Liu Y.; Deng Y.; Bai Y.; Dong Q.; Huang J.
发表日期	2017
ISSN	17545692
起始页码	516
结束页码	522
卷号	10 期号:2
英文摘要	The stability of perovskite solar cells has shown a huge variation with respect to the film process and film morphology, while the underlining mechanism for the morphology-dependent degradation of the perovskite film has remained elusive. Herein, we report a scaling behavior of moisture-induced grain degradation in polycrystalline CH3NH3PbI3 films. The degradation rates of CH3NH3PbI3 films in moisture were shown to be sensitive to the grain sizes. The duration that was needed for different films to degrade by the same percent showed a linear relationship with the grain size, despite the fact that the films were formed by five different deposition methods. This scaling behavior can be explained by the degradation along the in-plane direction, which is initiated at the grain boundary (GB). The GBs of CH3NH3PbI3 films consist of an amorphous intergranular layer, which allows quick diffusion of moisture into the perovskite films. It was found that thermal annealing induced surface self-passivation plays a critical role in stabilizing the surfaces of thin films and single crystals by reducing the moisture-sensitive methylammonium ions at the surface. The determination of the scaling behavior of grain degradation highlights the importance of stabilizing the GBs to improve the stability of perovskite solar cells. © The Royal Society of Chemistry 2017.
英文关键词	Amorphous films; Amorphous materials; Degradation; Grain boundaries; Grain size and shape; Moisture; Perovskite; Perovskite solar cells; Scaling laws; Single crystals; Solar cells; Degradation rate; Deposition methods; In-plane direction; Linear relationships; Perovskite films; Perovskite thin films; Self-passivation; Thermal-annealing; Thin films; crystal structure; degradation; film; fuel cell; grain size; induced response; moisture; perovskite; scale effect; solar power
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190535
作者单位	Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, United States
推荐引用方式 GB/T 7714	Wang Q.,Chen B.,Liu Y.,et al. Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films[J],2017,10(2).
APA	Wang Q..,Chen B..,Liu Y..,Deng Y..,Bai Y..,...&Huang J..(2017).Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films.Energy & Environmental Science,10(2).
MLA	Wang Q.,et al."Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films".Energy & Environmental Science 10.2(2017).