Generation-recombination noise in multiple quantum well infrared photodetectors

摘要

Abstract: Generation-recombination noise in quantum well infrared photodetectors is considered theoretically. A numerical model and procedure for noise power calculation is proposed. It is shown that the transient response current due to extra charge generation from a QW is not described by a simple exponential model. Transient current is composed of fast and slow components. The autocorrelation coefficient is also non- exponential, having two components with different time scales and amplitudes. The noise power spectral density has a strong frequency dispersion at low frequencies, due to the modulation of the injection current from the emitter. Analytical model for non-equilibrium high-frequency noise is proposed. !13