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. 2016 Dec 12;7:13713. doi: 10.1038/ncomms13713

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Copyright © 2016, 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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(a) The photos of SnSe single crystal, (b) cleaved sample, (c) XRD pattern of SnSe single crystals. (h00) diffraction peaks indicate that the crystallographic a axis is perpendicular to the cleaved plane of the single crystal. The inset is FE-SEM image. Note that all samples, including undoped and Bi-doped samples, show identical XRD pattern.