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. 2020 Aug 13;12:164. doi: 10.1007/s40820-020-00503-4

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 12 — a Schematic representation of a self-powered chemical sensor fabricated by graphene-based photovoltaic heterojunction device (right) and energy band diagram of the device (left). Change in photocurrent of graphene/Si/metal and graphene/WS₂/graphene device under b NO₂, c NH₃ and d H₂ ambient. Histograms of the relative percentage change in photocurrent (red) and photovoltage (blue) to NO₂, NH₃ and H₂ gases of e graphene/Si/metal and f graphene/WS₂/graphene device under white light illumination. Reproduced with permission [105]. Copyright 2018, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim