The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.
Probing excitonic states in suspended two-dimensional semiconductors by photocurrent spectroscopy
Open accessAbstract
The optical response of semiconducting monolayer transition-metal dichalcogenides (TMDCs) is dominated by strongly bound excitons that are stable even at room temperature. However, substrate-related effects such as screening and disorder in currently available specimens mask many anticipated physical phenomena and limit device applications of TMDCs. Here, we demonstrate that that these undesirable effects are strongly suppressed in suspended devices. Extremely robust (photogain > 1,000) and fast (response time < 1 ms) photoresponse allow us to study, for the first time, the formation, binding energies and dissociation mechanisms of excitons in TMDCs through photocurrent spectroscopy. By analyzing the spectral positions of peaks in the photocurrent and by comparing them with first-principles calculations, we obtain binding energies, band gaps and spin-orbit splitting in monolayer TMDCs. For monolayer MoS 2, in particular, we obtain an extremely large binding energy for band-edge excitons, Ebind ≥ 570 meV. Along with band-edge excitons, we observe excitons associated with a van Hove singularity of rather unique nature. The analysis of the source-drain voltage dependence of photocurrent spectra reveals exciton dissociation and photoconversion mechanisms in TMDCs.
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Cites
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Cited by
Bandgap 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
k · p theory for two-dimensional transition metal dichalcogenide semiconductors
Kormányos, A., Burkard, G., Gmitra, M., Fabian, J., Zólyomi, V., Drummond, N. D., & Fal’ko, V. (2015) · 2D Materials · doi:10.1088/2053-1583/2/2/022001 · Cited by 1,076
Photocurrent generation with two-dimensional van der Waals semiconductors
Buscema, M., Island, J. O., Groenendijk, D. J., Blanter, S. I., Steele, G. A., van der Zant, H. S. J., & Castellanos-Gomez, A. (2015) · Chemical Society Reviews · doi:10.1039/c5cs00106d · Cited by 1,051
Large-Area Epitaxial Monolayer MoS2
Dumcenco, D., Ovchinnikov, D., Marinov, K., Lazić, P., Gibertini, M., Marzari, N., Sanchez, O. L., Kung, Y.-C., Krasnozhon, D., Chen, M.-W., et al. (2015) · ACS Nano · doi:10.1021/acsnano.5b01281 · Cited by 888
Wang, G., Marie, X., Gerber, I., Amand, T., Lagarde, D., Bouet, L., Vidal, M., Balocchi, A., & Urbaszek, B. (2015) · Physical Review Letters · doi:10.1103/physrevlett.114.097403 · Cited by 640
Metadata
- Authors
- Klots, A. R., Newaz, A. K. M., Wang, B., Prasai, D., Krzyzanowska, H., Lin, J., Caudel, D., Ghimire, N. J., Yan, J., Ivanov, B. L., Velizhanin, K. A., Burger, A., Mandrus, D. G., Tolk, N. H., Pantelides, S. T., & Bolotin, K. I.
- Venue
- Scientific Reports
- Published
- 2014-10-16
- Volume
- 4
- Issue
- 1
- Pages
- 6608-6608
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2000573041
- Cited by
- 435
- References
- 6
- FWCI
- 22.93
- Type
- journal article
- Language
- en
- Open access
- gold
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