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. 2022 Jun 13;13:3397. doi: 10.1038/s41467-022-31016-w

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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. 4 — a XRD spectra indicating the generation of CsBr (110) peak (marked by the red arrow) with different hydrogenation time. b XRD spectra of the Cs₂AgBiBr₆ (044) peak under different hydrogenation time. c Evolution tendency for the XRD area proportion of CsBr (110) peak as compared with the ones of Cs₂AgBiBr₆, inset shows the peak shift of Cs₂AgBiBr₆ (044) to the low XRD angle during the hydrogenation treatment. d–g Quasi in situ observation for the structural evolution of hydrogenated Cs₂AgBiBr₆ film, red and orange markers indicate the Cs₂AgBiBr₆ and CsBr phases, respectively. The detailed evolution process of the areas marked with baby blue rectangles in Fig. 4d–f were listed in Fig. 4g. h–k HAADF images of pristine and hydrogenated Cs₂AgBiBr₆ films, and the corresponding Fast Fourier transform (FFT) images for the areas marked by red and blue boxes.