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. 2019 Jun 7;11:50. doi: 10.1007/s40820-019-0282-0

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© The Author(s) 2019

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. 4 — a Device stability of control and TTC-based PVSCs. The contact angles of different films: b perovskite, c perovskite/C₆₀, d perovskite/TTC, and e perovskite/TTC/C₆₀