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Effect of graphene grain boundaries on MoS2/graphene heterostructures
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作者 Yue Zhang Xiangzhe Zhang +7 位作者 Chuyun Deng Qi Ge Junjie Huang Jie Lu gaoxiang lin Zekai Weng Xueao Zhang Weiwei Cai 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第6期44-48,共5页
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 MoS2/gra... 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 MoS2/graphene heterostructures are studied.It is found that the blueshift of the G and 2D peaks of graphene in Raman spectrum is due to doping.The lattice mismatch at the graphene boundaries results in a blueshift of MoS2 features in the photoluminescence spectra,comparing to the MoS2 grown on SiO2.In addition,the photocurrent signal in MoS2/hexagonal single-crystal graphene heterostructures is successfully captured without bias,but not in MoS2/polycrystalline graphene heterostructures.The electron scattering at graphene grain boundaries affects the optical response of MoS2/graphene heterostructures.The photoresponse of the device is attributed to the optical absorption and response of MoS2 and the high carrier mobility of graphene.These findings offer a new approach to develop optoelectronic devices based on two-dimensional material heterostructures. 展开更多
关键词 PHOTORESPONSE HETEROSTRUCTURES GRAIN-BOUNDARY
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