Effect of graphene grain boundaries on MoS2/graphene heterostructures

被引：4

作者：

Zhang, Yue ^{[1
]}

Zhang, Xiangzhe ^{[2
]}

Deng, Chuyun ^{[2
]}

Ge, Qi ^{[3
]}

Huang, Junjie ^{[1
]}

Lu, Jie ^{[1
]}

Lin, Gaoxiang ^{[1
]}

Weng, Zekai ^{[1
]}

Zhang, Xueao ^{[1
,3
]}

Cai, Weiwei ^{[1
,3
]}

机构：

[1] Xiamen Univ, Coll Phys Sci & Technol, Xiamen 361005, Peoples R China

[2] Natl Univ Def Technol, Coll Arts & Sci, Changsha 410073, Peoples R China

[3] Chongqing 2D Mat Inst, Chongqing 400714, Peoples R China

来源：

CHINESE PHYSICS B | 2020年 / 29卷 / 06期

基金：

中国国家自然科学基金;

关键词：

photoresponse; heterostructures; grain-boundary; MOS2; QUALITY; GROWTH;

D O I：

10.1088/1674-1056/ab8a37

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 MoS(2)features in the photoluminescence spectra, comparing to the MoS(2)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 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.

引用

页数：5

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