Effect of graphene grain boundaries on MoS_2/graphene heterostructures |
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| Authors: | Yue Zhang Xiangzhe Zhang Chuyun Deng Qi Ge Junjie Huang Jie Lu Gaoxiang Lin Zekai Weng Xueao Zhang Weiwei Cai |
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| Affiliation: | (College of Physical Science and Technology,Xiamen University,Xiamen 361005,China;College of Arts and Science,National University of Defense Technology,Changsha 410073,China;Chongqing 2D Materials Institute,Chongqing 400714,China) |
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| Abstract: | The grain boundaries of graphene are disordered topological defects, which would strongly affect the physical and chemical properties of graphene. In this paper, the spectral characteristics and photoresponse of MoS_2/graphene heterostructures are studied. It is found that the blueshift of the G and 2 D peaks of graphene in Raman spectrum is due to doping. The lattice mismatch at the graphene boundaries results in a blueshift of MoS_2 features in the photoluminescence spectra, comparing to the MoS_2 grown on SiO_2. In addition, the photocurrent signal in MoS_2/hexagonal single-crystal graphene heterostructures is successfully captured without bias, but not in MoS_2/polycrystalline graphene heterostructures.The electron scattering at graphene grain boundaries affects the optical response of MoS_2/graphene heterostructures. The photoresponse of the device is attributed to the optical absorption and response of MoS_2 and the high carrier mobility of graphene. These findings offer a new approach to develop optoelectronic devices based on two-dimensional material heterostructures. |
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