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Research Article

Vapor growth of WSe2/WS2 heterostructures with stacking dependent optical properties

Xueping Wu§, Xiao Wang§, Honglai Li, Zhouxiaosong Zeng, Biyuan Zheng, Danliang Zhang, Fang Li, Xiaoli Zhu, Ying Jiang( ), Anlian Pan( )
Key Laboratory for Micro-Nano Physics and Technology of Hunan ProvinceSchool of Physics and ElectronicsCollege of Materials and Engineering State Key Laboratory of Chemo/Biosensing and ChemometricsHunan UniversityChangsha410082China

§Xueping Wu and Xiao Wang contributed equally to this work.

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Abstract

Two-dimensional (2D) vertically stacked heterostructures based on layered transition-metal dichalcogenides (TMDCs) have remarkable potential in future applications due to their rich interlayer related properties, such as interlayer excitons, tunable interlayer band alignments. However, the controlled growth of TMDC bilayer heterostructures with preferred stacking structure remains challenging. Here, we report a two-step van der Waals epitaxial vapor growth of WSe2/WS2 vertically stacked bilayer heterostructures with controllable commensurate crystallographic alignments (so called AA and AB stacking), by controlling the deposition temperature. Moiré patterns were obtained in both AA and AB stacked WSe2/WS2 heterostructures. The stacking configuration of the vertical heterostructures was verified by the second harmonic generation signals. Photoluminescence and Raman spectroscopy studies further confirm that the heterostructures with different stacking configuration have obviously different optical properties, which is ascribed to the distinct interlayer coupling and resonance excitation between the distinguishing AA and AB stacked heterostructures. The controlled growth of AA and AB stacked heterostructures could provide an importance platform not only for fundamental researches but also for functional electronic and optoelectronic device applications.

Keywords

two-dimensionalvertical heterostructurestackingcontrollable

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Nano Research
Volume 12 Issue 12,
December 2019
Pages 3123-3128
DOI: 10.1007/s12274-019-2564-8
Cite this article:
Wu X, Wang X, Li H, et al. Vapor growth of WSe2/WS2 heterostructures with stacking dependent optical properties. Nano Research, 2019, 12(12): 3123-3128. https://doi.org/10.1007/s12274-019-2564-8
Topics:
Optoelectronic devicesSemiconductor quantum wellsTransition metalsVan der Waals forces

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Received: 18 July 2019
Revised: 21 September 2019
Accepted: 06 November 2019
Published: 14 November 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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