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Structural and chemical properties of anion exchanged CsPb(Br(1−x)Cl x )3 heterostructured perovskite nanowires imaged by nanofocused x-rays

Marçal, L. A.B. LU ; Lamers, N. LU ; Hammarberg, S. LU ; Zhang, Zhaojun LU ; Chen, Huaiyu LU ; Dzhigaev, D. LU orcid ; Gomez-Gonzalez, M. A. ; Parker, J. E. ; Björling, A. LU and Mikkelsen, A. LU , et al. (2024) In Nanotechnology 35(26).
Abstract

Over the last years metal halide perovskites have demonstrated remarkable potential for integration in light emitting devices. Heterostructures allow for tunable bandgap depending on the local anion composition, crucial for optoelectronic devices, but local structural effects of anion exchange in single crystals is not fully understood. Here, we investigate how the anion exchange of CsPbBr3 nanowires fully and locally exposed to HCl vapor affects the local crystal structure, using nanofocused x-rays. We study the nanoscale composition and crystal structure as function of HCl exposure time and demonstrate the correlation of anion exchange with changes in the lattice parameter. The local composition was measured by x-ray... (More)

Over the last years metal halide perovskites have demonstrated remarkable potential for integration in light emitting devices. Heterostructures allow for tunable bandgap depending on the local anion composition, crucial for optoelectronic devices, but local structural effects of anion exchange in single crystals is not fully understood. Here, we investigate how the anion exchange of CsPbBr3 nanowires fully and locally exposed to HCl vapor affects the local crystal structure, using nanofocused x-rays. We study the nanoscale composition and crystal structure as function of HCl exposure time and demonstrate the correlation of anion exchange with changes in the lattice parameter. The local composition was measured by x-ray fluorescence and x-ray diffraction, with general agreement of both methods but with much less variation using latter. The heterostructured nanowires exhibit unintentional gradients in composition, both axially and radially. Ferroelastic domains are observed for all HCl exposure times, and the magnitude of the lattice tilt at the domain walls scales with the Cl concentration.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
heterostructures, nanowires, x-ray diffraction, x-ray fluorescence
in
Nanotechnology
volume
35
issue
26
article number
265710
publisher
IOP Publishing
external identifiers
  • pmid:38502953
  • scopus:85190297511
ISSN
0957-4484
DOI
10.1088/1361-6528/ad355c
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 The Author(s). Published by IOP Publishing Ltd
id
93a506d6-3a05-48eb-9e9f-d2c1babfb43b
date added to LUP
2024-04-22 09:51:52
date last changed
2024-08-26 21:40:26
@article{93a506d6-3a05-48eb-9e9f-d2c1babfb43b,
  abstract     = {{<p>Over the last years metal halide perovskites have demonstrated remarkable potential for integration in light emitting devices. Heterostructures allow for tunable bandgap depending on the local anion composition, crucial for optoelectronic devices, but local structural effects of anion exchange in single crystals is not fully understood. Here, we investigate how the anion exchange of CsPbBr<sub>3</sub> nanowires fully and locally exposed to HCl vapor affects the local crystal structure, using nanofocused x-rays. We study the nanoscale composition and crystal structure as function of HCl exposure time and demonstrate the correlation of anion exchange with changes in the lattice parameter. The local composition was measured by x-ray fluorescence and x-ray diffraction, with general agreement of both methods but with much less variation using latter. The heterostructured nanowires exhibit unintentional gradients in composition, both axially and radially. Ferroelastic domains are observed for all HCl exposure times, and the magnitude of the lattice tilt at the domain walls scales with the Cl concentration.</p>}},
  author       = {{Marçal, L. A.B. and Lamers, N. and Hammarberg, S. and Zhang, Zhaojun and Chen, Huaiyu and Dzhigaev, D. and Gomez-Gonzalez, M. A. and Parker, J. E. and Björling, A. and Mikkelsen, A. and Wallentin, J.}},
  issn         = {{0957-4484}},
  keywords     = {{heterostructures; nanowires; x-ray diffraction; x-ray fluorescence}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{26}},
  publisher    = {{IOP Publishing}},
  series       = {{Nanotechnology}},
  title        = {{Structural and chemical properties of anion exchanged CsPb(Br<sub>(1−x)</sub>Cl<sub> x </sub>)<sub>3</sub> heterostructured perovskite nanowires imaged by nanofocused x-rays}},
  url          = {{http://dx.doi.org/10.1088/1361-6528/ad355c}},
  doi          = {{10.1088/1361-6528/ad355c}},
  volume       = {{35}},
  year         = {{2024}},
}