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. 2022 Nov 5;13:6701. doi: 10.1038/s41467-022-34426-y

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Selected spatial q maps of the main diffraction peaks from the (MAPbBr₃)_0.50(FAPbI₃)_0.50 film: a (100), (110), (111), (200), (210), (220), revealing structure heterogeneity of the perovskite film. Different areas are selected, which ensures sufficient long-range features of the perovskite film. b Microstrain variations as a function of depth, extracted from the (100), (110), and (111) peaks. The solid line is a simple linear fit function, revealing the statistically-significant correlation of decreasing microstrain with depth. c Schematic illustration of the strain state in the perovskite material, demonstrating the lattice structure with the tensile strain present at the top surface of the perovskite film.