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. 2018 Aug 27;8:12840. doi: 10.1038/s41598-018-29717-8

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© The Author(s) 2018

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 staggered graphene/WTe₂ heterostructure device and photocurrent mapping. (a) An optical micrograph of the device, with graphene is staggered on top of WTe₂ flake. The area inside the black square is the scanned area. (b) Scanning photocurrent micrograph of the device acquired at V_DS = 0.1 V, with 0.6 μW power at 532 nm. Regions of photocurrent are observed in the overlapping area outlined by the WTe₂ flake (blue) with the patterned graphene film (purple). The electrodes are indicated by white dashed lines.