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Two-Dimensional Molybdenum Tungsten Diselenide Alloys: Photoluminescence, Raman Scattering, and Electrical Transport
Abstract
Two-dimensional transition-metal dichalcogenide alloys have attracted intense attention due to their tunable band gaps. In the present work, photoluminescence, Raman scattering, and electrical transport properties of monolayer and few-layer molybdenum tungsten diselenide alloys (Mo1-xWxSe2, 0 ≤ x ≤ 1) are systematically investigated. The strong photoluminescence emissions from Mo1-xWxSe2 monolayers indicate composition-tunable direct band gaps (from 1.56 to 1.65 eV), while weak and broad emissions from the bilayers indicate indirect band gaps. The first-order Raman modes are assigned by polarized Raman spectroscopy. Second-order Raman modes are assigned according to its frequencies. As composition changes in Mo1-xWxSe2 monolayers and few layers, the out-of-plane A1g mode showed one-mode behavior, while B2g(1) (only observed in few layers), in-plane E2g(1), and all observed second-order Raman modes showed two-mode behaviors. Electrical transport measurement revealed n-type semiconducting transport behavior with a high on/off ratio (>10(5)) for Mo1-xWxSe2 monolayers.
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Citations
Cites
MoSe 2 and WSe 2 Nanofilms with Vertically Aligned Molecular Layers on Curved and Rough Surfaces
Wang, H., Kong, D., Johanes, P., Cha, J. J., Zheng, G., Yan, K., Liu, N., & Cui, Y. (2013) · Nano Letters · doi:10.1021/nl401944f · Cited by 693
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Recent Advances in Two-Dimensional Materials beyond Graphene
Bhimanapati, G. R., Lin, Z., Meunier, V., Jung, Y., Cha, J., Das, S., Xiao, D., Son, Y., Strano, M. S., Cooper, V. R., et al. (2015) · ACS Nano · doi:10.1021/acsnano.5b05556 · Cited by 2,659
Zhang, X., Qiao, X.-F., Shi, W., Wu, J.-B., Jiang, D.-S., & Tan, P.-H. (2015) · Chemical Society Reviews · doi:10.1039/c4cs00282b · Cited by 1,299
Self-citationBandgap engineering of two-dimensional semiconductor materials
Chaves, A., Azadani, J. G., Alsalman, H., da Costa, D. R., Frisenda, R., Chaves, A. J., Song, S. H., Kim, Y. D., He, D., Zhou, J., et al. (2020) · npj 2D Materials and Applications · doi:10.1038/s41699-020-00162-4 · Cited by 1,296
Shi, Y., Li, H., & Li, L.-J. (2015) · Chemical Society Reviews · doi:10.1039/c4cs00256c · Cited by 845
Li, S.-L., Tsukagoshi, K., Orgiu, E., & Samorì, P. (2016) · Chemical Society Reviews · doi:10.1039/c5cs00517e · Cited by 549
Metadata
- Authors
- Zhang, M., Wu, J., Zhu, Y., Dumcenco, D. O., Hong, J., Mao, N., Deng, S., Chen, Y., Yang, Y., Jin, C., Chaki, S. H., Huang, Y.-S., Zhang, J., & Xie, L.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-06-05
- Volume
- 8
- Issue
- 7
- Pages
- 7130-7137
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2312464357
- Cited by
- 253
- References
- 1
- FWCI
- 10.57
- Type
- journal article
- Language
- en
- Open access
- closed
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