In situ imaging of temperature-dependent fast and reversible nanoscale domain switching in a single-crystal perovskite

Lucas A.B. Marçal, Dmitry Dzhigaev, Zhaojun Zhang, Ella Sanders, Amnon Rothman, Edoardo Zatterin, Ewen Bellec, Tobias U. Schülli, Anders Mikkelsen, Ernesto Joselevich, Jesper Wallentin

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review


Metal halide perovskites exhibit a rich crystal structure, with multiple phases as well as ferroelastic domains, which is crucial for the optical and electrical properties. The average crystal phase-transition temperatures can be shifted by size, strain, or defects, but it is not clear whether such differences can also appear locally within a single crystal. The experimental study of domain dynamics within nanocrystals is challenging and requires a method capable of probing crystal lattice variations with both high spatial and temporal resolution. Here, we show that in situ full-field diffraction x-ray microscopy can be used to image domains in a single crystal CsPbBr3 nanoplatelet as the temperature traverses the orthorhombic to tetragonal phase transition, at 150 nm spatial resolution and 6 s time resolution. The images reveal sudden domain pattern changes faster than the temporal resolution. Surprisingly, we observe substantial local variations during heating, with domain changes occurring at different temperatures within the single crystal. The nanoplatelet exhibits a high-temperature domain pattern completely different from the low-temperature one, but both patterns are reproducible, and we reversibly switch between them in multiple cycles. These results demonstrate that single CsPbBr3 crystals can exhibit substantial local variation of their basic crystal properties.

TidskriftPhysical Review Materials
StatusPublished - 2022 maj

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© 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the ""Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by ""Bibsam.

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  • Den kondenserade materiens fysik


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