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Research Article

Optical identification of interlayer coupling of graphene/MoS2 van der Waals heterostructures

Mingming Yang1,§, Longlong Wang1,§, Guofeng Hu2,§, Xue Chen3, Peng Lai Gong4, Xin Cong3, Yi Liu1, Yuanbo Yang1, Xiaoli Li1( ), Xiaohui Zhao1( ), Xuelu Liu3( )
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China

§ Mingming Yang, Longlong Wang, and Guofeng Hu contributed equally to this work.

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Abstract

The interlayer coupling in van der Waals (vdW) heterostructures (vdWHs) is at the frontier of the fundamental research, underlying many optical behaviors. The graphene/MoS2 vdWHs provide an ideal platform to reveal the good interfacial coupling between graphene and MoS2 constituents. Here, three groups of graphene/MoS2 vdWHs were prepared by transferring 1-3 layers of graphene onto monolayer MoS2. The interlayer coupling within graphene/MoS2 vdWHs were characterized and analyzed by Raman spectroscopy, photoluminescence (PL) spectroscopy and optical contrast (OC) spectroscopy. The upshift of the A1g peak of MoS2 and the upshift of the D and 2D peaks of SLG show that the electrons move from MoS2 to graphene accompanied by the dielectric shielding effect on graphene. The weakened PL intensities and the slight red shift of A peak prove that the electrons move from MoS2 to graphene meanwhile the recombination of hole and electron pairs is blocked in vdWHs. Our results deepen the understanding of the interlayer coupling of graphene/MoS2 vdWHs and therefore provide guidelines for the practical design and application of optoelectronic devices based on graphene/MoS2 vdWHs.

Keywords

graphene/MoS2 vdWHsRaman spectroscopyPL spectroscopyOC spectroscopydielectric shielding effectinterlayer coupling

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Nano Research
Volume 14 Issue 7,
July 2021
Pages 2241-2246
DOI: 10.1007/s12274-020-3215-9
Cite this article:
Yang M, Wang L, Hu G, et al. Optical identification of interlayer coupling of graphene/MoS2 van der Waals heterostructures. Nano Research, 2021, 14(7): 2241-2246. https://doi.org/10.1007/s12274-020-3215-9
Topics:
Layered semiconductorsMolybdenum compoundsOptoelectronic devicesPhotoluminescence spectroscopyVan der Waals forces

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Received: 30 July 2020
Revised: 20 October 2020
Accepted: 30 October 2020
Published: 05 July 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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