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. 2019 Feb 7;9:1641. doi: 10.1038/s41598-018-37219-w

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© The Author(s) 2019

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) Cross-sectional ADF STEM image of a 2D MoS₂/WSe₂ hetero vertical-stack. The inset shows the corresponding sample where 2D MoS₂ layers were integrated on top of 2D WSe₂ layers. The scale bar is 1 cm. (b,c) High-resolution ADF-STEM (b) and TEM (c) images of the corresponding 2D MoS₂/WSe₂ hetero-interface. (d) STEM-EDS elemental maps to show the spatial distribution of constituent elements in the hetero vertical-stack. The scale bar is 10 nm. (e,f) EDS profiles obtained from each stack of (e) 2D MoS₂ and (f) 2D WSe₂.