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. 2018 Aug 1;8:11545. doi: 10.1038/s41598-018-29942-1

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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) Absorbance spectra of MoSe₂ crystals and mechanically exfoliated flakes on sapphire with two excitonic peaks A and B, (b) optical microscopy image and schematic cross-section of an MoSe₂ phototransistor along the red line, (c) I_d − V_g and (d) I_d − V_d characteristics of an MoSe₂ phototransistor with different optical power of incident light.