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Probing Interlayer Interactions in Transition Metal Dichalcogenide Heterostructures by Optical Spectroscopy: MoS2/WS2 and MoSe2/WSe2
Abstract
We have applied optical absorption spectroscopy to investigate van der Waals heterostructures formed of pairs of monolayer transition metal dichalcogenide crystals, choosing MoS2/WS2 and MoSe2/WSe2 as test cases. In the heterostructure spectra, we observe a significant broadening of the excitonic transitions compared to the corresponding features in the isolated layers. The broadening is interpreted as a lifetime effect arising from decay of excitons initially created in either layer through charge transfer processes expected for a staggered band alignment. The measured spectral broadening of 20 meV - 35 meV implies lifetimes for charge separation of the near band-edge A and B excitons in the range of 20-35 fs. Higher-lying transitions exhibit still greater broadening.
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Cites
Electronics and optoelectronics of two-dimensional transition metal dichalcogenides
Wang, Q. H., Kalantar-Zadeh, K., Kis, A., Coleman, J. N., & Strano, M. S. (2012) · Nature Nanotechnology · doi:10.1038/nnano.2012.193 · Cited by 16,374
Two-dimensional atomic crystals
Novoselov, K. S., Jiang, D., Schedin, F., Booth, T. J., Khotkevich, V. V., Morozov, S. V., & Geim, A. K. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0502848102 · Cited by 11,788
Cited by
Optical modulators with 2D layered materials
Sun, Z., Martinez, A., & Wang, F. (2016) · Nature Photonics · doi:10.1038/nphoton.2016.15 · Cited by 1,515
Pham, P. V., Bodepudi, S. C., Shehzad, K., Liu, Y., Xu, Y., Yu, B., & Duan, X. (2022) · Chemical Reviews · doi:10.1021/acs.chemrev.1c00735 · Cited by 708
Li, C., Cao, Q., Wang, F., Xiao, Y., Li, Y., Delaunay, J.-J., & Zhu, H. (2018) · Chemical Society Reviews · doi:10.1039/c8cs00067k · Cited by 494
Self-citationUltrafast formation of interlayer hot excitons in atomically thin MoS2/WS2 heterostructures
Chen, H., Wen, X., Zhang, J., Wu, T., Gong, Y., Zhang, X., Yuan, J., Yi, C., Lou, J., Ajayan, P. M., et al. (2016) · Nature Communications · doi:10.1038/ncomms12512 · Cited by 432
Hill, H. M., Rigosi, A. F., Rim, K. T., Flynn, G. W., & Heinz, T. F. (2016) · Nano Letters · doi:10.1021/acs.nanolett.6b01007 · Cited by 317
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Metadata
- Authors
- Rigosi, A. F., Hill, H. M., Li, Y., Chernikov, A., & Heinz, T. F.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-07-21
- Volume
- 15
- Issue
- 8
- Pages
- 5033-5038
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2303985945
- Cited by
- 330
- References
- 2
- FWCI
- 13.59
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rigosi, A. F., Hill, H. M., Li, Y., Chernikov, A., & Heinz, T. F. (2015). Probing Interlayer Interactions in Transition Metal Dichalcogenide Heterostructures by Optical Spectroscopy: MoS2/WS2 and MoSe2/WSe2. Nano Letters. https://doi.org/10.1021/acs.nanolett.5b01055
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