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

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

Research output: Contribution to journalArticlepeer-review

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 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.

Original languageEnglish
Article number265710
JournalNanotechnology
Volume35
Issue number26
DOIs
Publication statusPublished - 2024 Jun 24

Subject classification (UKÄ)

  • Condensed Matter Physics

Free keywords

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

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