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. 2016 Nov 29;6:37833. doi: 10.1038/srep37833

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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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Surface and cross-sectional SEM images of WS₂ films grown on sapphire substrate (a) without Ni promoter (type A film), (b) with Ni promoter (type B film) and (c) WS₂ film grown on n-GaN/sapphire substrate with Ni promoter (type C film).