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. 2018 Jan 9;30(1):79-83.
doi: 10.1021/acs.chemmater.7b04827. Epub 2017 Dec 11.

Colloidal CsX (X = Cl, Br, I) Nanocrystals and Their Transformation to CsPbX3 Nanocrystals by Cation Exchange

Javad Shamsi  1   2 , Zhiya Dang  1 , Palvasha Ijaz  1   2 , Ahmed L Abdelhady  1   3 , Giovanni Bertoni  1 , Iwan Moreels  1 , Liberato Manna  1
Affiliations

Colloidal CsX (X = Cl, Br, I) Nanocrystals and Their Transformation to CsPbX3 Nanocrystals by Cation Exchange

Javad Shamsi et al. Chem Mater. .
No abstract available

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a–c) Transmission electron microscopy (TEM) images of representative samples of CsX NCs. Scale bars are 100 nm in all images; (d) Optical absorption spectra of CsX NCs dispersed in hexane; (e) Sketch of the cubic structure of CsX; f) XRD patterns of the dried powders of CsX NCs, in comparison with the corresponding ICSD reference patterns (CsCl: 98-062-2366, CsBr: 98-002-2174, CsI: 98-004-4291).
Figure 2
Figure 2
HRTEM images of NCs during different stages of the CsBr → CsPbBr3 transformation (top) and corresponding strain maps (Δxy), obtained by geometric phase analysis (bottom). In the top panels, the perovskite domains are color coded in yellow. (Figure S10 of the SI shows a broader set of intermediate samples, without color coding). The scale bar is 2 nm; (a, b) a NC in is early stage, with a thin CsPbBr3 shell; (c, d and e, f) Two NCs in their intermediate stages; (g, h) a fully transformed CsPbBr3 NC. In panels a, c, and e, the inset is the FFT of the region that is delimited by the white box. The inset of panel g is the FFT of the whole image.
Figure 3
Figure 3
(a–c) TEM images of CsBr NCs of three representative sizes (top panels) and corresponding TEM images of the resulting CsPbBr3 NCs (bottom panels). Scale bars correspond to 50 nm in all images; (d) corresponding optical spectra and (e) XRD patterns of the resulting CsPbBr3 NCs (ICSD reference pattern: 98-009-7852).
See this image and copyright information in PMC

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