Optical identification of interlayer coupling of graphene/MoS 2 van der Waals heterostructures
NANO RESEARCH(2021)
摘要
The interlayer coupling in van der Waals (vdW) heterostructures (vdWHs) is at the frontier of the fundamental research, underlying many optical behaviors. The graphene/MoS 2 vdWHs provide an ideal platform to reveal the good interfacial coupling between graphene and MoS 2 constituents. Here, three groups of graphene/MoS 2 vdWHs were prepared by transferring 1–3 layers of graphene onto monolayer MoS 2 . The interlayer coupling within graphene/MoS 2 vdWHs were characterized and analyzed by Raman spectroscopy, photoluminescence (PL) spectroscopy and optical contrast (OC) spectroscopy. The upshift of the A 1g peak of MoS 2 and the upshift of the D and 2D peaks of SLG show that the electrons move from MoS 2 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 MoS 2 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/MoS 2 vdWHs and therefore provide guidelines for the practical design and application of optoelectronic devices based on graphene/MoS 2 vdWHs.
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关键词
graphene/MoS2 vdWHs, Raman spectroscopy, PL spectroscopy, OC spectroscopy, dielectric shielding effect, interlayer coupling
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