Abstract
Terahertz radiation has uses in applications ranging from security to medicine1. However, sensitive room-temperature detection of terahertz radiation is notoriously difficult2. The hot-electron photothermoelectric effect in graphene is a promising detection mechanism; photoexcited carriers rapidly thermalize due to strong electron–electron interactions3,4, but lose energy to the lattice more slowly3,5. The electron temperature gradient drives electron diffusion, and asymmetry due to local gating6,7 or dissimilar contact metals8 produces a net current via the thermoelectric effect. Here, we demonstrate a graphene thermoelectric terahertz photodetector with sensitivity exceeding 10 V W–1 (700 V W–1) at room temperature and noise-equivalent power less than 1,100 pW Hz–1/2 (20 pW Hz–1/2), referenced to the incident (absorbed) power. This implies a performance that is competitive with the best room-temperature terahertz detectors9 for an optimally coupled device, and time-resolved measurements indicate that our graphene detector is eight to nine orders of magnitude faster than those7,10. A simple model of the response, including contact asymmetries (resistance, work function and Fermi-energy pinning) reproduces the qualitative features of the data, and indicates that orders-of-magnitude sensitivity improvements are possible.
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Acknowledgements
This work was sponsored by the US Office of Naval Research (awards nos. N000140911064, N000141310712 and N000141310865), the National Science Foundation (ECCS 1309750) and Intelligence Advanced Research Projects Activity. M.S.F. was supported in part by an Australian Research Council Laureate Fellowship. The authors thank V. D. Wheeler and C. Eddy, Jr, for discussions.
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X.C., A.B.S., J.Y., T.E.M., H.D.D. and M.S.F. conceived the experiments. X.C. fabricated the graphene photodetectors. X.C., A.B.S. and G.S.J. carried out the terahertz measurements. X.C., R.J.S., M.M.J. and S.L. carried out the near-infrared and pulsed laser measurements. X.C. and J.Y. carried out the d.c. and a.c. transport measurements. L.O.N., R.L.M-W. and D.K.G. synthesized the graphene on SiC. All authors contributed to writing the manuscript.
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Cai, X., Sushkov, A., Suess, R. et al. Sensitive room-temperature terahertz detection via the photothermoelectric effect in graphene. Nature Nanotech 9, 814–819 (2014). https://doi.org/10.1038/nnano.2014.182
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DOI: https://doi.org/10.1038/nnano.2014.182
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