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Ultra-Sensitive and Plasmon-Tunable Graphene Photodetectors for Micro-Spectrometer


We demonstrate an ultra-sensitive photodetector based on graphene/monolayer MoS2 vertical heterostructure working at room temperature. Highly confined plasmon waves are efficiently excited through a periodic array of monolayer graphene ribbons in which plasmon resonance has remarkably large oscillation strength, resulting in sharp optical absorption peak in the normal-incidence transmission spectrum. A significant amount of electron-hole pairs are produced in graphene ribbons with optical absorption, separated by the built-in electric field across the graphene/MoS2 heterojunction. The responsivity reaches up to 〖1×10〗^7 A/W at room temperature due to very strong resonance in the heterostructure, yielding a highly sensitive graphene-based photodetector. Additionally, the absorption can be tuned over a wide spectral range (6~16 μm) by varying gate biasing. The ultra-sensitive, spectrally tunable photodetector could be potentially used as a promising candidate for mid-infrared micro-spectrometer.

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Publication details

The article was received on 20 Jun 2018, accepted on 02 Oct 2018 and first published on 03 Oct 2018

Article type: Paper
DOI: 10.1039/C8NR04996C
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ultra-Sensitive and Plasmon-Tunable Graphene Photodetectors for Micro-Spectrometer

    Y. Liu, T. Gong, Y. Zheng, X. Wang, J. Xu, Q. Ai, J. Guo, W. Huang, S. Zhou, Z. Liu, Y. Lin, T. Ren and B. Yu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04996C

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