Effect of graphene grain boundaries on MoS2/graphene heterostructures  

作　　者：Yue Zhang Xiangzhe Zhang Chuyun Deng Qi Ge Junjie Huang Jie Lu Gaoxiang Lin Zekai Weng Xueao Zhang Weiwei Cai 张悦;张祥喆;邓楚芸;葛奇;黄俊杰;卢捷;林高翔;翁泽锴;张学骜;蔡伟伟(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)

机构地区：[1]College of Physical Science and Technology,Xiamen University,Xiamen 361005,China [2]College of Arts and Science,National University of Defense Technology,Changsha 410073,China [3]Chongqing 2D Materials Institute,Chongqing 400714,China

出　　处：《Chinese Physics B》2020年第6期44-48,共5页中国物理B（英文版）

基　　金：National Natural Science Foundation of China(Grant No.11874423).

摘　　要：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.

关 键 词：PHOTORESPONSE HETEROSTRUCTURES GRAIN-BOUNDARY 

分 类 号：TQ127.11[化学工程—无机化工]