钙钛矿(结构)
堆积
材料科学
卤化物
扫描透射电子显微镜
纳米晶
相(物质)
相变
化学物理
纳米技术
光电子学
透射电子显微镜
结晶学
凝聚态物理
无机化学
化学
核磁共振
物理
有机化学
作者
Yusheng Liu,Suya Liu,Xu Liang,Mengmeng Ma,Xuliang Zhang,Xiao Chen,Fei Wei,Bin Song,Tao Cheng,Jianyu Yuan,Boyuan Shen
出处
期刊:Small
[Wiley]
日期:2024-03-03
卷期号:20 (31)
标识
DOI:10.1002/smll.202400013
摘要
Abstract Ruddlesden–Popper (RP) interface with defined stacking structure will fundamentally influence the optoelectronic performances of lead‐halide perovskite (LHP) materials and devices. However, it remains challenging to observe the atomic local structures in LHPs, especially for multi‐dimensional RP interface hidden inside the nanocrystal. In this work, the advantages of two imaging modes in scanning transmission electron microscopy (STEM), including high‐angle annular dark field (HAADF) and integrated differential phase contrast (iDPC) STEM, are successfully combined to study the bulk and local structures of inorganic and organic/inorganic hybrid LHP nanocrystals. Then, the multi‐dimensional RP interfaces in these LHPs are atomically resolved with clear gap and blurred transition region, respectively. In particular, the complex interface by the RP stacking in 3D directions can be analyzed in 2D projected image. Finally, the phase transition, ion missing, and electronic structures related to this interface are investigated. These results provide real‐space evidence for observing and analyzing atomic multi‐dimensional RP interfaces, which may help to better understand the structure‐property relation of LHPs, especially their complex local structures.
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