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DOI	10.1016/j.scib.2020.05.020
	Transmission electron microscopy of organic-inorganic hybrid perovskites: myths and truths
	Chen S.; Zhang Y.; Zhao J.; Mi Z.; Zhang J.; Cao J.; Feng J.; Zhang G.; Qi J.; Li J.; Gao P.
发表日期	2020
ISSN	20959273
起始页码	1643
结束页码	1649
卷号	65 期号:19
英文摘要	Organic-inorganic hybrid perovskites (OIHPs) have attracted extensive research interest as a promising candidate for efficient and inexpensive solar cells. Transmission electron microscopy (TEM) characterizations that can benefit the fundamental understanding and the degradation mechanism are widely used for these materials. However, their sensitivity to the electron beam illumination and hence structural instabilities usually prevent us from obtaining the intrinsic information or even lead to significant artifacts. Here, we systematically investigate the structural degradation behaviors under different experimental factors to reveal the optimized conditions for TEM characterizations of OIHPs by using low-dose electron diffraction and imaging techniques. We find that a low temperature (−180 °C) does not slow down the beam damage but instead induces a rapid amorphization for OIHPs. Moreover, a less severe damage is observed at a higher accelerating voltage. The beam-sensitivity is found to be facet-dependent that a (1 0 0) exposed CH3NH3PbI3 (MAPbI3) surface is more stable than a (0 0 1) surface. With these guidance, we successfully acquire the atomic structure of pristine MAPbI3 and identify the characterization window that is very narrow. These findings are helpful to guide future electron microscopy characterizations of these beam-sensitive materials, which are also useful for finding strategies to improve the stability and performance of the perovskite solar cells. © 2020 Science China Press
关键词	Atomic structure CH3NH3PbI3 Beam damage mechanism Facet dependency Organic-inorganic hybrid perovskites Transmission electron microscopy
英文关键词	Degradation; Electrons; High resolution transmission electron microscopy; Perovskite; Perovskite solar cells; Temperature; Transmissions; Accelerating voltages; Degradation mechanism; Electron diffraction and imaging; Optimized conditions; Organic-inorganic hybrid; Structural degradation; Structural instability; Transmission electron microscopy (TEM) characterizations; organic-inorganic materials
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207006
作者单位	Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China; School of Materials Science and Engineering, School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China; Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China; Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China; International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
推荐引用方式 GB/T 7714	Chen S.,Zhang Y.,Zhao J.,et al. Transmission electron microscopy of organic-inorganic hybrid perovskites: myths and truths[J],2020,65(19).
APA	Chen S..,Zhang Y..,Zhao J..,Mi Z..,Zhang J..,...&Gao P..(2020).Transmission electron microscopy of organic-inorganic hybrid perovskites: myths and truths.Science Bulletin,65(19).
MLA	Chen S.,et al."Transmission electron microscopy of organic-inorganic hybrid perovskites: myths and truths".Science Bulletin 65.19(2020).