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. 2017 Nov 17;3(11):eaao5616. doi: 10.1126/sciadv.aao5616

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A to C) The temperature-dependent conductivity of the convex film (A), the flat film (B), and the concave film (C). Inset: Schematic diagram of the samples. (D) Variation of the activation energy of ion migration versus the strain in the MAPbI₃ films.