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. 2017 Jul 7;8:16045. doi: 10.1038/ncomms16045

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Copyright © 2017, The Author(s)

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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(a) Current density–voltage (J–V) characteristic of the inverted planar FA_0.85MA_0.15PbI_2.55Br_0.45 perovskite solar cell. The device architecture is shown as an inset. (b) J–V characteristic of the standard planar perovskite solar cell. The device architecture is shown as an inset. (c) Photocurrent density and the corresponding efficiency of the inverted planar perovskite solar cell measured as a function time at a constant forward bias of 0.925 V under an AM1.5G standard sunlight. (d) Photocurrent density and the corresponding efficiency of the standard planar perovskite solar cell measured as a function time at a constant forward bias of 0.925 V under an AM1.5G standard sunlight.