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. 2017 Jan 9;8:13938. doi: 10.1038/ncomms13938

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Characteristics of inverted perovskite collar cells with varied cathode/electron extraction assemblies (AZO/SnO_x/Ag, AZO/Ag and LiF/Al) versus time of storage in ambient air (at 23 °C and 50% rH). J_sc (a), V_oc (b), FF (c) and PCE (d). The characteristics have been determined from the J/V measurements in reverse direction (examples in Supplementary Fig. 2).