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Journal Articles AIP Advances Year : 2022

Current-induced enhancement of photo-response in graphene THz radiation detectors

Abstract

Thermoelectric readout in a graphene terahertz (THz) radiation detector requires a p- n junction across the graphene channel. Even without an intentional p- n junction, two latent junctions can exist in the vicinity of the electrodes/antennas through the proximity to the metal. In a symmetrical structure, these junctions are connected back-to-back and therefore counterbalance each other with regard to rectification of the ac signal. Because of the Peltier effect, a small dc current results in additional heating in one and cooling in another p- n junction, thereby breaking the symmetry. The p- n junctions then no longer cancel, resulting in a greatly enhanced rectified signal. This allows simplifying the design and controlling the sensitivity of THz radiation detectors.
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Dates and versions

hal-03887746 , version 1 (08-12-2022)

Licence

Attribution - CC BY 4.0

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K. Indykiewicz, Cédric Bray, C. Consejo, F Teppe, S. Danilov, et al.. Current-induced enhancement of photo-response in graphene THz radiation detectors. AIP Advances, 2022, 12 (11), pp.115009. ⟨10.1063/5.0117818⟩. ⟨hal-03887746⟩
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