Inducing ferroelastic domains in single-crystal CsPbBr3 perovskite nanowires using atomic force microscopy

Lucas A.B. Marçal, Sandra Benter, Austin Irish, Dmitry Dzhigaev, Eitan Oksenberg, Amnon Rothman, Ella Sanders, Susanna Hammarberg, Zhaojun Zhang, Simone Sala, Alexander Björling, Eva Unger, Anders Mikkelsen, Ernesto Joselevich, Rainer Timm, Jesper Wallentin

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Ferroelectric and ferroelastic domains have been predicted to enhance metal halide perovskite (MHP) solar cell performance. While the formation of such domains can be modified by temperature, pressure, or strain, established methods lack spatial control at the level of single domains. Here, we induce the formation of ferroelastic domains in CsPbBr3 nanowires at room temperature using an atomic force microscope (AFM) tip and visualize the domains using nanofocused x-ray diffraction with a 60 nm beam. Regions scanned with a low AFM tip force show orthorhombic 004 reflections along the nanowire axis, while regions exposed to higher forces exhibit 220 reflections. The applied stress locally changes the crystal structure, leading to lattice tilts that define ferroelastic domains, which spread spatially and terminate at {112}-type domain walls. The ability to induce individual ferroelastic domains within MHPs using AFM gives new possibilities for device design and fundamental experimental studies.

Original languageEnglish
Article numberL063001
JournalPhysical Review Materials
Volume5
Issue number6
DOIs
StatePublished - 1 Jun 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Physics and Astronomy (miscellaneous)

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