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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. 6 — a XRD patterns of one-step deposited (FA)_x(MA)_1−xSnI₃ (x = 0.00, 0.25, 0.50, 0.75, and 1.00) films on ITO/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) substrates. b Absorption spectra and c normalized PL spectra of the different perovskite films on quartz substrates. d A 2 × 2 × 2 supercell of (FA)₂Sn₂I₆ depicting a model of the hollow perovskite with two SnI₂ vacancies [(FA)₁₆Sn₁₄I₄₄]. e XRD patterns and f optical absorption of the {en}FASnI₃ perovskite crystals with various molar ratios of FA to {en}. Reproduced with permission from Ref. [88]