Rehm, RobertRobertRehmSchneider, H.H.SchneiderWalther, MartinMartinWaltherKoidl, P.P.Koidl2022-03-032022-03-032002https://publica.fraunhofer.de/handle/publica/20209410.1063/1.1435071We show that the dark current noise spectrum of an In(0.30)Ga(0.70)As/GaAs quantum-well infrared photodetector (QWIP) is characterized by two plateau-like frequency regions. At high frequencies, the observed noise current is due to the generation-recombination noise of carriers, which have been emitted thermionically from the quantum wells into the continuum. In the low-frequency regime, an additional contribution to the noise current is caused by the redistribution of space charges, that occurs on a time scale similar to the dielectric relaxation time.enQWIPinfrared detectorInfrarotdetektordark current noiseDunkelstromRauschennoise spectruminfrared imaging systems621667journal article