Numerical analysis of quantum ring intersubband photodetector for far infrared detection

摘要

A quantum ring based intersubband photodetector is designed and its optical performance is studied based on a developed theoretical model. Intersubband absorption of quantum rings is numerically calculated for two transitions, from ground state to first excited state and to continuum energy and the effects of broadening mechanisms are studied. Device show responsivity about 0.2 AAV at T = 80K and V = 2 V. Dark current of structure with and without the resonant tunneling barriers is calculated. Specific detectivity (D~*) is studied at different temperatures and peak values about 3 × 10~(12) cm Hz~(1/2)/W is obtained at T=50K. Results show that inclusion of resonant tunneling barriers leads to improvement in D~* about one order of magnitude.