Visible-to-near-infrared photodetector based on graphene-MoTe2-graphene heterostructure

doi:10.1088/1674-1056/ab4576

Abstract Graphene and transition metal dichalcogenides (TMDs), two-dimensional materials, have been investigated wildely in recent years. As a member of the TMD family, MoTe₂ possesses a suitable bandgap of~1.0 eV for near infrared (NIR) photodetection. Here we stack the MoTe₂ flake with two graphene flakes of high carrier mobility to form a graphene-MoTe₂-graphene heterostructure. It exhibits high photo-response to a broad spectrum range from 500 nm to 1300 nm. The photoresponsivity is calculated to be 1.6 A/W for the 750-nm light under 2 V/0 V drain-source/gate bias, and 154 mA/W for the 1100-nm light under 0.5 V/60 V drain-source/gate bias. Besides, the polarity of the photocurrent under zero V_ds can be efficiently tuned by the back gate voltage to satisfy different applications. Finally, we fabricate a vertical graphene-MoTe₂-graphene heterostructure which shows improved photoresponsivity of 3.3 A/W to visible light.

Keywords: two-dimensional materials van der Waals heterostructure transition metal dichalcogenides (TMDs) graphene photodetector

Received: 30 May 2019
Revised: 25 July 2019
Accepted manuscript online:

PACS:	78.20.Jq	(Electro-optical effects)
	42.79.Hp	(Optical processors, correlators, and modulators)
	42.70.Gi	(Light-sensitive materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 21405109) and the Seed Foundation of State Key Laboratory of Precision Measurement Technology and Instruments, China (Pilt No. 1710).

Corresponding Authors: Jing Liu
E-mail: jingliu_1112@tju.edu.cn

Cite this article:

Rui-Xue Hu(户瑞雪), Xin-Li Ma(马新莉), Chun-Ha An(安春华), Jing Liu(刘晶) Visible-to-near-infrared photodetector based on graphene-MoTe₂-graphene heterostructure 2019 Chin. Phys. B 28 117802

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Visible-to-near-infrared photodetector based on graphene-MoTe2-graphene heterostructure

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Visible-to-near-infrared photodetector based on graphene-MoTe₂-graphene heterostructure