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. 2018 Jan 16;10(2):34. doi: 10.1007/s40820-018-0187-3

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — SEM images of a top view of the CsPbBr₃ perovskite film and b top view of the CsPbBr₃ perovskite film deposited with CuPc. c Cross-sectional SEM image of the whole device. d Close-up of the structure under higher magnification. e XRD spectra of the FTO/TiO₂, FTO/TiO₂/CsPbBr₃, and FTO/TiO₂/CsPbBr₃/CuPc. f UV–Vis absorbance spectra of the CuPc, FTO/TiO₂/CsPbBr₃, and FTO/TiO₂/CsPbBr₃/CuPc