期刊
INORGANIC CHEMISTRY
卷 58, 期 2, 页码 1555-1560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b03078
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资金
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy [DE-SC0014334]
- University of Notre Dame Integrated Imaging Facility
- Patrick and Jana Eilers Graduate Student Fellowship
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences [DE-FC02-04ER15533]
The atomic structure of CsPbBr3 nanocubes (NCs) was studied at the single-particle level via a high-resolution transmission electron microscopy (HRTEM) defocus-series analysis. The technique entails acquiring lattice-resolved HRTEM images of individual NCs over progressive defocus values. CsPbBr3 NC atomic structure was evaluated by comparing acquired experimental data to simulated lattice-resolved images and corresponding Fourier transform patterns of both orthorhombic (Pnma) and cubic (Pm (3) over barm) CsPbBr3 polymorphs. Herein, CsPbBr3 NCs with average edge lengths (l) of l similar to 10 and 5 nm are analyzed using the aforementioned technique. In the former, we find evidence for the coexistence of both cubic and orthorhombic lattices. In the latter, solely cubic character is observed, illustrating a potential size dependency to the crystal symmetry of CsPbBr3 NCs. Such structural measurements provide critical insight into elucidating the structure/(optical and electrical) function relationship of CsPbBr3 NCs.
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