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. 2020 Jul 31;12:156. doi: 10.1007/s40820-020-00494-2

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© The Author(s) 2020

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, b PL and TRPL spectra of CsPbI₂Br films fabricated using RT and hot casting [88]. Copyright © 2019 The Royal Society of Chemistry. c Trap density of states for the device with 1-h and 48-h aged perovskite precursors [46]. Copyright © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. d V_oc as a function of illumination light intensity for a large-grain device (180 °C) and a small-grain device (100 °C) [19]. Copyright © 2017 American Association for the Advancement of Science. e J–V characteristics of PSCs swept from 1.0 to − 1.0 V in the dark. f J–V characteristics of hole-only devices [53]. Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim