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. 2020 Mar 28;12:80. doi: 10.1007/s40820-020-00417-1

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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. 4 — a UV–Vis absorption spectrum of In-BTC nanocrystals. b PL spectrum of In-BTC nanocrystals and the UV–Vis absorption spectrum of perovskite film. c CV curve of In-BTC nanocrystals. d Energy-level diagram of PSCs with perovskite/In-BTC heterojunction as the light-harvesting layers. e J–V curves for PSCs employing perovskite/In-BTC heterojunction with different addition concentrations of In-BTC nanocrystals. The inset shows the cross-view SEM image of PSCs. f Optimal and average PCE values obtained from 20 separated PSC devices