journal article·2020-11-24

Twist Angle-Dependent Optical Responses in Controllably Grown WS2 Vertical Homojunctions

Gonglei Shao, Xiong-Xiong Xue, Xiao Liu, Danliang Zhang, Yuanyuan Jin, Yangwu Wu, Bingying You, Yung-Chang Lin, Shisheng Li, Kazu Suenaga, Xiao Wang, Anlian Pan, Huimin Li, Jinhua Hong, Yexin Feng, Song Liu

Chemistry of Materials· Volume 32· Issue 22
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Abstract

Interlayer coupling in two-dimensional (2D) materials with specific stacking modes results in angle-dependent electrical and optical behaviors. Compared to multilayered WS2 with a 0° twist angle grown under normal conditions, WS2 sheets with a 60° twist angle are prepared by chemical vapor deposition (CVD) with the assistance of tin (Sn) for reducing stacking energy. The layer number can be effectively regulated by the growth temperature and hydrogen flow. The 2H-like phase of the 60° bilayer structure is revealed by scanning transmission electron microscopy (STEM), displaying intense photoluminescence (PL) variation and diverse second harmonic generation due to interlayer coupling. The bilayer WS2 with various twist angles can be obtained for angle-dependent Raman/PL response. Density functional theory (DFT) calculations demonstrate that heteroatom Sn can tip the balance between 0° and 60° bilayers, facilitating the formation of the bilayer with a 60° stacking angle. The heteroatom-assisted approach provides a general strategy for the self-assembly of 2D materials. The heterostructures with tunable twist angles can be prepared, which broadens their applications in moiré excitons, spintronics, and valley electronics of transition metal dichalcogenides.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Chemical Biology and Nanomedicine (ICBN), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China

Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, P. R. China

School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, P. R. China

Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronics, Hunan University, Changsha 410082, P. R. China

Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan

International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan

Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · Hunan University · Japan Society for the Promotion of Science · National Natural Science Foundation of China · Hunan Province

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