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. 2020 Apr 3;11:1672. doi: 10.1038/s41467-020-15451-1

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© The Author(s) 2020

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. 3 — Schematic of quasi-2D perovskite films excited from a the front side (air side) and e the back side (glass side). The corresponding TA spectra at different delay times of b, f (BA)₂(MA)₃Pb₄I₁₃, c, g pristine, and d, h APSA-treated (MAMP)MA₃Pb₄I₁₃ films, respectively. i Schematic model showing internal charge transfer from low <n> value to high <n> value phases. j–l TA kinetics extracted from different GSB (n = 3, 4, 5) at front-side excitation for different films.