Issue 42, 2018

Ultra-sensitive and plasmon-tunable graphene photodetectors for micro-spectrometry

Abstract

We demonstrate an ultra-sensitive photodetector based on a 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 oscillator strength, resulting in a sharp optical absorption peak in the normal-incidence transmission spectrum. A significant amount of electron–hole pairs are produced in graphene ribbons by optical absorption, separated by the built-in electric field across the graphene/MoS2 heterojunction. The responsivity reaches up to 1 × 107 A W−1 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-spectrometers.

Graphical abstract: Ultra-sensitive and plasmon-tunable graphene photodetectors for micro-spectrometry

Article information

Article type
Paper
Submitted
20 Jun 2018
Accepted
02 Oct 2018
First published
03 Oct 2018

Nanoscale, 2018,10, 20013-20019

Ultra-sensitive and plasmon-tunable graphene photodetectors for micro-spectrometry

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, 10, 20013 DOI: 10.1039/C8NR04996C

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