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Two-Step Growth of Two-Dimensional WSe2/MoSe2 Heterostructures
Open accessAbstract
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. 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.
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Cites
Two-dimensional gas of massless Dirac fermions in graphene
Novoselov, K. S., Geim, A. K., Morozov, S. V., Jiang, D., Katsnelson, M. I., Grigorieva, I. V., Dubonos, S. V., & Firsov, A. A. (2005) · Nature · doi:10.1038/nature04233 · Cited by 21,611
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Zeng, M., Xiao, Y., Liu, J., Yang, K., & Fu, L. (2018) · Chemical Reviews · doi:10.1021/acs.chemrev.7b00633 · Cited by 574
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Ning, C.-Z., Dou, L., & Yang, P. (2017) · Nature Reviews Materials · doi:10.1038/natrevmats.2017.70 · Cited by 455
Molybdenum diselenide (MoSe 2 ) for energy storage, catalysis, and optoelectronics
Eftekhari, A. (2017) · Applied Materials Today · doi:10.1016/j.apmt.2017.01.006 · Cited by 435
A two-dimensional Fe-doped SnS2 magnetic semiconductor
Li, B., Xing, T., Zhong, M., Huang, L., Lei, N., Zhang, J., Li, J., & Wei, Z. (2017) · Nature Communications · doi:10.1038/s41467-017-02077-z · Cited by 423
Self-citationVan der Waals heterostructures
Castellanos-Gomez, A., Duan, X., Fei, Z., Gutierrez, H. R., Huang, Y., Huang, X., Quereda, J., Qian, Q., Sutter, E., & Sutter, P. (2022) · Nature Reviews Methods Primers · doi:10.1038/s43586-022-00139-1 · Cited by 423
Metadata
- Authors
- Gong, Y., Lei, S., Ye, G., Li, B., He, Y., Keyshar, K., Zhang, X., Wang, Q., Lou, J., Liu, Z., Vajtai, R., Zhou, W., & Ajayan, P. M.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-08-06
- Volume
- 15
- Issue
- 9
- Pages
- 6135-6141
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2345736499
- Cited by
- 568
- References
- 1
- FWCI
- 24.51
- Type
- journal article
- Language
- en
- Open access
- green
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- Gong, Y., Lei, S., Ye, G., Li, B., He, Y., Keyshar, K., Zhang, X., Wang, Q., Lou, J., Liu, Z., Vajtai, R., Zhou, W., & Ajayan, P. M. (2015). Two-Step Growth of Two-Dimensional WSe2/MoSe2 Heterostructures. Nano Letters. https://doi.org/10.1021/acs.nanolett.5b02423
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