Current-induced enhancement of photo-response in graphene THz radiation detectors
Journal article, 2022
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.
Author
Kornelia Indykiewicz
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
C. Bray
Centre national de la recherche scientifique (CNRS)
C. Consejo
Centre national de la recherche scientifique (CNRS)
F. Teppe
Centre national de la recherche scientifique (CNRS)
S. Danilov
University of Regensburg
S. D. Ganichev
University of Regensburg
Polish Academy of Sciences
Avgust Yurgens
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
AIP Advances
2158-3226 (ISSN) 21583226 (eISSN)
Vol. 12 11 115009Subject Categories
Accelerator Physics and Instrumentation
Signal Processing
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1063/5.0117818