Graphene vertical hot-electron terahertz detectors

We propose and analyze the concept of the vertical hot-electron terahertz (THz) graphene-layer detectors (GLDs) based on the double-GL and multiple-GL structures with the barrier layers made of materials with a moderate conduction band off-set (such as tungsten disulfide and related materials). The...

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Bibliographic Details
Published in:Journal of applied physics 2014-09, Vol.116 (11)
Main Authors: Ryzhii, V., Satou, A., Otsuji, T., Ryzhii, M., Mitin, V., Shur, M. S.
Format: Article
Language:English
Subjects:
ABSORPTION
Applied physics
Barrier layers
BOLOMETERS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conduction bands
DEPLETION LAYER
Detectors
ELECTRONS
EXCITATION
Far infrared radiation
FREQUENCY RANGE
GRAPHENE
GRATINGS
Heating
Incident radiation
Intraband absorption
METALS
Photoelectricity
PHOTONS
Plasma oscillations
PLASMA WAVES
QUANTUM WELLS
Radiation absorption
SENSITIVITY
SENSORS
TEMPERATURE RANGE 0273-0400 K
Terahertz frequencies
THERMIONIC EMISSION
THZ RANGE
Tungsten disulfide
TUNGSTEN SULFIDES
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Summary:We propose and analyze the concept of the vertical hot-electron terahertz (THz) graphene-layer detectors (GLDs) based on the double-GL and multiple-GL structures with the barrier layers made of materials with a moderate conduction band off-set (such as tungsten disulfide and related materials). The operation of these detectors is enabled by the thermionic emissions from the GLs enhanced by the electrons heated by incoming THz radiation. Hence, these detectors are the hot-electron bolometric detectors. The electron heating is primarily associated with the intraband absorption (the Drude absorption). In the frame of the developed model, we calculate the responsivity and detectivity as functions of the photon energy, GL doping, and the applied voltage for the GLDs with different number of GLs. The detectors based on the cascade multiple-GL structures can exhibit a substantial photoelectric gain resulting in the elevated responsivity and detectivity. The advantages of the THz detectors under consideration are associated with their high sensitivity to the normal incident radiation and efficient operation at room temperature at the low end of the THz frequency range. Such GLDs with a metal grating, supporting the excitation of plasma oscillations in the GL-structures by the incident THz radiation, can exhibit a strong resonant response at the frequencies of several THz (in the range, where the operation of the conventional detectors based on A3B5 materials, in particular, THz quantum-well detectors, is hindered due to a strong optical phonon radiation absorption in such materials). We also evaluate the characteristics of GLDs in the mid- and far-infrared ranges where the electron heating is due to the interband absorption in GLs.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4895738