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. 2021 Apr 1;12:2023. doi: 10.1038/s41467-021-22193-1

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© The Author(s) 2021

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. 1 — a FAPbX₃ (X = I, Br), CsPbBr₃, and MAPbX₃ (X = I, Br, Cl) single crystals. b A series of mixed-halide MAPbI_xBr_3−x and MAPbBr_xCl_3−x single crystals (0 ≤ x ≤ 3). c, d The mixed-organic cation MA_yFA_1−yPbX₃ (X = I, Br) single crystals (0 ≤ y ≤ 1).