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Wide-angle x-ray diffraction evidence of structural coherence in CsPbBr3 nanocrystal superlattices

Toso, Stefano ; Baranov, Dmitry LU orcid ; Giannini, Cinzia ; Marras, Sergio and Manna, Liberato (2019) In ACS Materials Letters 1(2). p.272-276
Abstract

Films made of colloidal CsPbBr3 nanocrystals packed in isolated or densely-packed superlattices display a remarkably high degree of structural coherence. The structural coherence is revealed by the presence of satellite peaks accompanying Bragg reflections in wide-angle X-ray diffraction experiments in parallel-beam reflection geometry. The satellite peaks, also called “superlattice reflections”, arise from the interference of X-rays diffracted by the atomic planes of the orthorhombic perovskite lattice. The interference is due to the precise spatial periodicity of the nanocrystals separated by organic ligands in the superlattice. The presence of satellite peaks is a fingerprint of the high crystallinity and long-range order... (More)

Films made of colloidal CsPbBr3 nanocrystals packed in isolated or densely-packed superlattices display a remarkably high degree of structural coherence. The structural coherence is revealed by the presence of satellite peaks accompanying Bragg reflections in wide-angle X-ray diffraction experiments in parallel-beam reflection geometry. The satellite peaks, also called “superlattice reflections”, arise from the interference of X-rays diffracted by the atomic planes of the orthorhombic perovskite lattice. The interference is due to the precise spatial periodicity of the nanocrystals separated by organic ligands in the superlattice. The presence of satellite peaks is a fingerprint of the high crystallinity and long-range order of nanocrystals, comparable to those of multilayer superlattices prepared by physical methods. The angular separation between satellite peaks is highly sensitive to changes in the superlattice periodicity. These characteristics of the satellite peaks are exploited to track the superlattice compression under vacuum, as well as to observe the superlattice growth in situ from colloidal solutions by slow solvent evaporation.

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author
; ; ; and
publishing date
type
Contribution to journal
publication status
published
in
ACS Materials Letters
volume
1
issue
2
pages
5 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85097136373
ISSN
2639-4979
DOI
10.1021/acsmaterialslett.9b00217
language
English
LU publication?
no
additional info
Funding Information: The work of S.T. and L.M. was supported by the European Union under grant agreement no. 614897 (ERC Grant TRANS-NANO). The work of D.B. was supported by the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 794560 (RETAIN). Funding Information: The work of S.T. and L.M. was supported by the European Union under grant agreement no. 614897 (ERC Grant TRANS-NANO). The work of D.B. was supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 794560 (RETAIN). Publisher Copyright: © 2020 American Chemical Society. All rights reserved.
id
be9bf103-8c6a-4271-bc91-e073a67a6906
date added to LUP
2023-01-17 11:59:17
date last changed
2023-02-14 12:43:17
@article{be9bf103-8c6a-4271-bc91-e073a67a6906,
  abstract     = {{<p>Films made of colloidal CsPbBr<sub>3</sub> nanocrystals packed in isolated or densely-packed superlattices display a remarkably high degree of structural coherence. The structural coherence is revealed by the presence of satellite peaks accompanying Bragg reflections in wide-angle X-ray diffraction experiments in parallel-beam reflection geometry. The satellite peaks, also called “superlattice reflections”, arise from the interference of X-rays diffracted by the atomic planes of the orthorhombic perovskite lattice. The interference is due to the precise spatial periodicity of the nanocrystals separated by organic ligands in the superlattice. The presence of satellite peaks is a fingerprint of the high crystallinity and long-range order of nanocrystals, comparable to those of multilayer superlattices prepared by physical methods. The angular separation between satellite peaks is highly sensitive to changes in the superlattice periodicity. These characteristics of the satellite peaks are exploited to track the superlattice compression under vacuum, as well as to observe the superlattice growth in situ from colloidal solutions by slow solvent evaporation.</p>}},
  author       = {{Toso, Stefano and Baranov, Dmitry and Giannini, Cinzia and Marras, Sergio and Manna, Liberato}},
  issn         = {{2639-4979}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{272--276}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Materials Letters}},
  title        = {{Wide-angle x-ray diffraction evidence of structural coherence in CsPbBr<sub>3</sub> nanocrystal superlattices}},
  url          = {{http://dx.doi.org/10.1021/acsmaterialslett.9b00217}},
  doi          = {{10.1021/acsmaterialslett.9b00217}},
  volume       = {{1}},
  year         = {{2019}},
}