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Influence of the recharging process on the dark current noise in quantum-well infrared photodetectors

Der Einfluss der Quantentopf-Aufladung auf das Dunkelstromrauschen in Quantentopf-Infrarot-Photodetektoren
: Rehm, R.; Schneider, H.; Walther, M.; Koidl, P.


Applied Physics Letters 80 (2002), No.5, pp.862-864
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
QWIP; infrared detector; Infrarotdetektor; dark current noise; Dunkelstrom; Rauschen; noise spectrum; infrared imaging systems

We 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.