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. 2021 Jan 25;13:62. doi: 10.1007/s40820-020-00578-z

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 11 — a A representation of the layered structure of (CH₃NH₃)₃Bi₂I₉, characterized by isolated [Bi₂I₉]³⁻ anions and two crystallographic inequivalent CH₃NH₃⁺ cations. b Small single-crystal powder grown from Bi₂O₃ and CH₃NH₃I in concentrated HI (I–III). And (CH₃NH₃)₃Bi₂I₉ thin films deposited by the antisolvent assisted crystallization method (ASAC) using GBL/DMSO and GBL as solvents and chlorobenzene as antisolvent (IV). c Diffraction patterns of (CH₃NH₃)₃Bi₂I₉ thin films, powder and simulated powder from single-crystal XRD measurements. d EQE of a typical FTO/TiO₂/(CH₃NH₃)₃Bi₂I₉/spiro-MeOTAD/Au device. e J–V scanning of the best-forming device. Reproduced with permission from Ref. [163]