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Huaiyu Chen

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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

Author

  • L. A.B. Marçal
  • N. Lamers
  • S. Hammarberg
  • Zhaojun Zhang
  • Huaiyu Chen
  • D. Dzhigaev
  • M. A. Gomez-Gonzalez
  • J. E. Parker
  • A. Björling
  • A. Mikkelsen
  • J. Wallentin
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Summary, in English

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.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • NanoLund: Centre for Nanoscience
  • Synchrotron Radiation Research
  • MAX IV Laboratory
  • Chemical Physics

Publishing year

2024-06-24

Language

English

Publication/Series

Nanotechnology

Volume

35

Issue

26

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • heterostructures
  • nanowires
  • x-ray diffraction
  • x-ray fluorescence

Status

Published

ISBN/ISSN/Other

  • ISSN: 0957-4484