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Defects activated photoluminescence in two-dimensional semiconductors: interplay between bound, charged and free excitons
Open accessAbstract
Point defects in semiconductors can trap free charge carriers and localize excitons. The interaction between these defects and charge carriers becomes stronger at reduced dimensionalities and is expected to greatly influence physical properties of the hosting material. We investigated effects of anion vacancies in monolayer transition metal dichalcogenides as two-dimensional (2D) semiconductors where the vacancies density is controlled by α-particle irradiation or thermal-annealing. We found a new, sub-bandgap emission peak as well as increase in overall photoluminescence intensity as a result of the vacancy generation. Interestingly, these effects are absent when measured in vacuum. We conclude that in opposite to conventional wisdom, optical quality at room temperature cannot be used as criteria to assess crystal quality of the 2D semiconductors. Our results not only shed light on defect and exciton physics of 2D semiconductors, but also offer a new route toward tailoring optical properties of 2D semiconductors by defect engineering.
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Cited by
Schaibley, J. R., Yu, H., Clark, G., Rivera, P., Ross, J. S., Seyler, K. L., Yao, W., & Xu, X. (2016) · Nature Reviews Materials · doi:10.1038/natrevmats.2016.55 · Cited by 2,652
Highly anisotropic and robust excitons in monolayer black phosphorus
Wang, X., Jones, A. M., Seyler, K. L., Tran, V., Jia, Y., Zhao, H., Wang, H., Yang, L., Xu, X., & Xia, F. (2015) · Nature Nanotechnology · doi:10.1038/nnano.2015.71 · Cited by 1,450
Single quantum emitters in monolayer semiconductors
He, Y.-M., Clark, G., Schaibley, J. R., He, Y., Chen, M.-C., Wei, Y.-J., Ding, X., Zhang, Q., Yao, W., Xu, X., et al. (2015) · Nature Nanotechnology · doi:10.1038/nnano.2015.75 · Cited by 1,020
Voiry, D., Fullon, R., Yang, J., de Carvalho Castro e Silva, C., Kappera, R., Bozkurt, I., Kaplan, D., Lagos, M. J., Batson, P. E., Gupta, G., et al. (2016) · Nature Materials · doi:10.1038/nmat4660 · Cited by 824
Material platforms for spin-based photonic quantum technologies
Atatüre, M., Englund, D., Vamivakas, N., Lee, S.-Y., & Wrachtrup, J. (2018) · Nature Reviews Materials · doi:10.1038/s41578-018-0008-9 · Cited by 766
Metadata
- Authors
- Tongay, S., Suh, J., Ataca, C., Fan, W., Luce, A., Kang, J. S., Liu, J., Ko, C., Raghunathanan, R., Zhou, J., Ogletree, F., Li, J., Grossman, J. C., & Wu, J.
- Venue
- Scientific Reports
- Published
- 2013-09-13
- Volume
- 3
- Issue
- 1
- Pages
- 2657-2657
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2137794177
- Cited by
- 1,086
- References
- 2
- FWCI
- 29.01
- Type
- journal article
- Language
- en
- Open access
- gold
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- Tongay, S., Suh, J., Ataca, C., Fan, W., Luce, A., Kang, J. S., Liu, J., Ko, C., Raghunathanan, R., Zhou, J., Ogletree, F., Li, J., Grossman, J. C., & Wu, J. (2013). Defects activated photoluminescence in two-dimensional semiconductors: interplay between bound, charged and free excitons. Scientific Reports. https://doi.org/10.1038/srep02657
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