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Increased Responsivity of Suspended Graphene Photodetectors
Abstract
The responsivity of graphene photodetectors depends critically on the elevated temperature of the electronic subsystem upon photoexcitation. We investigate the role of the substrate in providing cooling pathways for photoexcited carriers under ambient conditions by partially suspending few-layer graphene over a trench. Through photocurrent microscopy, we observe p-n junctions near the supported/suspended interfaces that produce photothermoelectric currents. Most importantly, we find the photocurrent in suspended p-n junctions to be an order of magnitude larger than in supported structures. This enhancement is attributed to the elimination of a dominant electronic cooling channel via the surface phonons of the polar substrate. Our work documents this mechanism of energy exchange between graphene and its environment, and it points to the importance of dielectric engineering for future improved graphene photodetectors.
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Citations
Cites
Graphene photodetectors for high-speed optical communications
Mueller, T., Xia, F., & Avouris, P. (2010) · Nature Photonics · doi:10.1038/nphoton.2010.40 · Cited by 2,474
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Cited by
Photodetectors based on graphene, other two-dimensional materials and hybrid systems
Koppens, F. H. L., Mueller, T., Avouris, P., Ferrari, A. C., Vitiello, M. S., & Polini, M. (2014) · Nature Nanotechnology · doi:10.1038/nnano.2014.215 · Cited by 3,828
Self-citationGraphene–MoS2 hybrid structures for multifunctional photoresponsive memory devices
Roy, K., Padmanabhan, M., Goswami, S., Sai, T. P., Ramalingam, G., Raghavan, S., & Ghosh, A. (2013) · Nature Nanotechnology · doi:10.1038/nnano.2013.206 · Cited by 1,436
CMOS-compatible graphene photodetector covering all optical communication bands
Pospischil, A., Humer, M., Furchi, M. M., Bachmann, D., Guider, R., Fromherz, T., & Mueller, T. (2013) · Nature Photonics · doi:10.1038/nphoton.2013.240 · Cited by 891
Recent Progress and Future Prospects of 2D‐Based Photodetectors
Huo, N., & Konstantatos, G. (2018) · Advanced Materials · doi:10.1002/adma.201801164 · Cited by 730
Plasmon induced thermoelectric effect in graphene
Shautsova, V., Sidiropoulos, T., Xiao, X., Güsken, N. A., Black, N. C. G., Gilbertson, A. M., Giannini, V., Maier, S. A., Cohen, L. F., & Oulton, R. F. (2018) · Nature Communications · doi:10.1038/s41467-018-07508-z · Cited by 710
Metadata
- Authors
- Freitag, M., Low, T., & Avouris, P.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-03-05
- Volume
- 13
- Issue
- 4
- Pages
- 1644-1648
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2078556467
- Cited by
- 192
- References
- 1
- FWCI
- 10.66
- Type
- journal article
- Language
- en
- Open access
- closed
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- Freitag, M., Low, T., & Avouris, P. (2013). Increased Responsivity of Suspended Graphene Photodetectors. Nano Letters. https://doi.org/10.1021/nl4001037
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