Design and analysis of a terahertz resonant tunneling quantum ring in a well photodetector

We design and analyze quantum ring (QR) and ring-in-a-well (RWELL) photodetector in order to operate in the terahertz range and calculate its absorption coefficient and dark current. Peak in the absorption coefficient spectrum, corresponds to about 32 μm, (9.3 THz). The active region of RWELL photodetector has 10 layers and the dark current increases with temperature and bias voltage. So we make use of resonant tunneling (RT) barriers to reduce dark current without impact on photocurrent. Dark current in the RT-RWEL photodetector is reduced near to 2 orders of magnitudes relative to RWELL photodetector.