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Dynamical aspects of carrier transport in quantumwell intersubband photodetectors

Dynamische Aspekte des Ladungsträgertransports in Quantum well-Intersubband-Photodetektoren
: Schneider, H.; Ehret, S.; Bihlmann, G.; Böhm, G.


Sizov, F.F.; Tetyorkin, V.V. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Material science and material properties for infrared optoelectronics : 30 September - 2 October 1996, Uzhgorod, Ukraine
Bellingham, Wash.: SPIE, 1997 (SPIE Proceedings Series 3182)
ISBN: 0-8194-2609-1
Conference "Material Science and Material Properties for Infrared Optoelectronics" <1997, Uzhgorod, Ukraine>
Conference Paper
Fraunhofer IAF ()
carrier capture; cohärenter Transport; coherent transport; Ladungsträgereinfang; quantum well intersubband photodetector; Quantum-Well-Intersubband-Photodetektor

We report on the dynamics of the transport processes which determine the photoresponse of quantum well intersubband infrared detectors. Immediately after intersubband excitation, coherent transport is important. This process can be identified via interference effects between photoexcited carriers. The carriers are re-captured subsequently within a few picoseconds. These fast transport processes give rise to space charges, which induce an additional, slow component of the photocurrent in the ns to mu s regime.