Current-induced enhancement of photo-response in graphene THz radiation detectors Auteur(s): Indykiewicz K., Bray C., Consejo C., Teppe F., Danilov S., Ganichev S. D., Yurgens A. (Document sans référence bibliographique) Texte intégral en Openaccess : Ref HAL: hal-03824950_v1 Ref Arxiv: 2210.02839 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: Thermoelectric readout in a graphene 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 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 to simplify the design and effectively control the sensitivity of the THz-radiation detectors. |