Two-step growth of two-dimensional WSe2/MoSe2 heterostructures
Abstract
Two dimensional (2D) materials have attracted great attention due to their unique properties and atomic thickness. Although various 2D materials have been successfully synthesized with different optical and electrical properties, a strategy for fabricating 2D heterostructures must be developed in order to construct more complicated devices for practical applications. Here we demonstrate for the first time a two-step chemical vapor deposition (CVD) method for growing transition-metal dichalcogenide (TMD) heterostructures, where MoSe2 was synthesized first and followed by an epitaxial growth of WSe2 on the edge and on the top surface of MoSe2. Compared to previously reported one-step growth methods, this two-step growth has the capability of spatial and size control of each 2D component, leading to much larger (up to 169 μm) heterostructure size, and cross-contamination can be effectively minimized. Furthermore, this two-step growth produces well-defined 2H and 3R stacking in the WSe2/MoSe2 bilayer regions and much sharper in-plane interfaces than the previously reported MoSe2/WSe2 heterojunctions obtained from one-step growth methods. The resultant heterostructures with WSe2/MoSe2 bilayer and the exposed MoSe2 monolayer display rectification characteristics of a p-n junction, as revealed by optoelectronic tests, and an internal quantum efficiency of 91% when functioning as a photodetector. As a result, amore »
- Authors:
-
- Rice Univ., Houston, TX (United States)
- Nanyang Technological Univ. (Singapore)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1214512
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 9; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 2D heterostructures; two-step growth; MoSe2; WSe2; CVD
Citation Formats
Gong, Yongji, Lei, Sidong, Lou, Jun, Liu, Zheng, Vajtai, Robert, Zhou, Wu, Ajayan, Pullikel M., Ye, Gonglan, Li, Bo, He, Yongmin, Keyshar, Kunttal, Zhang, Xiang, and Wang, Qizhong. Two-step growth of two-dimensional WSe2/MoSe2 heterostructures. United States: N. p., 2015.
Web. doi:10.1021/acs.nanolett.5b02423.
Gong, Yongji, Lei, Sidong, Lou, Jun, Liu, Zheng, Vajtai, Robert, Zhou, Wu, Ajayan, Pullikel M., Ye, Gonglan, Li, Bo, He, Yongmin, Keyshar, Kunttal, Zhang, Xiang, & Wang, Qizhong. Two-step growth of two-dimensional WSe2/MoSe2 heterostructures. United States. https://doi.org/10.1021/acs.nanolett.5b02423
Gong, Yongji, Lei, Sidong, Lou, Jun, Liu, Zheng, Vajtai, Robert, Zhou, Wu, Ajayan, Pullikel M., Ye, Gonglan, Li, Bo, He, Yongmin, Keyshar, Kunttal, Zhang, Xiang, and Wang, Qizhong. 2015.
"Two-step growth of two-dimensional WSe2/MoSe2 heterostructures". United States. https://doi.org/10.1021/acs.nanolett.5b02423. https://www.osti.gov/servlets/purl/1214512.
@article{osti_1214512,
title = {Two-step growth of two-dimensional WSe2/MoSe2 heterostructures},
author = {Gong, Yongji and Lei, Sidong and Lou, Jun and Liu, Zheng and Vajtai, Robert and Zhou, Wu and Ajayan, Pullikel M. and Ye, Gonglan and Li, Bo and He, Yongmin and Keyshar, Kunttal and Zhang, Xiang and Wang, Qizhong},
abstractNote = {Two dimensional (2D) materials have attracted great attention due to their unique properties and atomic thickness. Although various 2D materials have been successfully synthesized with different optical and electrical properties, a strategy for fabricating 2D heterostructures must be developed in order to construct more complicated devices for practical applications. Here we demonstrate for the first time a two-step chemical vapor deposition (CVD) method for growing transition-metal dichalcogenide (TMD) heterostructures, where MoSe2 was synthesized first and followed by an epitaxial growth of WSe2 on the edge and on the top surface of MoSe2. Compared to previously reported one-step growth methods, this two-step growth has the capability of spatial and size control of each 2D component, leading to much larger (up to 169 μm) heterostructure size, and cross-contamination can be effectively minimized. Furthermore, this two-step growth produces well-defined 2H and 3R stacking in the WSe2/MoSe2 bilayer regions and much sharper in-plane interfaces than the previously reported MoSe2/WSe2 heterojunctions obtained from one-step growth methods. The resultant heterostructures with WSe2/MoSe2 bilayer and the exposed MoSe2 monolayer display rectification characteristics of a p-n junction, as revealed by optoelectronic tests, and an internal quantum efficiency of 91% when functioning as a photodetector. As a result, a photovoltaic effect without any external gates was observed, showing incident photon to converted electron (IPCE) efficiencies of approximately 0.12%, providing application potential in electronics and energy harvesting.},
doi = {10.1021/acs.nanolett.5b02423},
url = {https://www.osti.gov/biblio/1214512},
journal = {Nano Letters},
issn = {1530-6984},
number = 9,
volume = 15,
place = {United States},
year = {Mon Aug 03 00:00:00 EDT 2015},
month = {Mon Aug 03 00:00:00 EDT 2015}
}
Web of Science
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