Effect of graphene grain boundaries on MoS2/graphene heterostructures

doi:10.1088/1674-1056/ab8a37

中国物理B ›› 2020, Vol. 29 ›› Issue (6): 67403-067403.doi: 10.1088/1674-1056/ab8a37

所属专题： SPECIAL TOPIC — Topological 2D materials

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Effect of graphene grain boundaries on MoS₂/graphene heterostructures

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

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

收稿日期:2019-12-15 修回日期:2020-04-13 出版日期:2020-06-05 发布日期:2020-06-05
通讯作者: Xueao Zhang, Weiwei Cai E-mail:xazhang@xmu.edu.cn;wwcai@xmu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11874423).

Effect of graphene grain boundaries on MoS₂/graphene heterostructures

Yue Zhang(张悦)¹, Xiangzhe Zhang(张祥喆)², Chuyun Deng(邓楚芸)², Qi Ge(葛奇)³, Junjie Huang(黄俊杰)¹, Jie Lu(卢捷)¹, Gaoxiang Lin(林高翔)¹, Zekai Weng(翁泽锴)¹, Xueao Zhang(张学骜)^1,3, Weiwei Cai(蔡伟伟)^1,3

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

Received:2019-12-15 Revised:2020-04-13 Online:2020-06-05 Published:2020-06-05
Contact: Xueao Zhang, Weiwei Cai E-mail:xazhang@xmu.edu.cn;wwcai@xmu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11874423).

摘要/Abstract

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

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 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.

Key words: photoresponse, heterostructures, grain-boundary

中图分类号: (Optical properties)

74.25.Gz

78.20.Jq (Electro-optical effects) 42.70.Gi (Light-sensitive materials)

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. Effect of graphene grain boundaries on MoS₂/graphene heterostructures[J]. 中国物理B, 2020, 29(6): 67403-067403.

Yue Zhang(张悦), Xiangzhe Zhang(张祥喆), Chuyun Deng(邓楚芸), Qi Ge(葛奇), Junjie Huang(黄俊杰), Jie Lu(卢捷), Gaoxiang Lin(林高翔), Zekai Weng(翁泽锴), Xueao Zhang(张学骜), Weiwei Cai(蔡伟伟). Effect of graphene grain boundaries on MoS₂/graphene heterostructures[J]. Chin. Phys. B, 2020, 29(6): 67403-067403.

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Effect of graphene grain boundaries on MoS₂/graphene heterostructures

Effect of graphene grain boundaries on MoS₂/graphene heterostructures

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