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  4. Ultrafast intersubband photocurrent response in quantum-well infrared photodetectors
 
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1997
Journal Article
Title

Ultrafast intersubband photocurrent response in quantum-well infrared photodetectors

Other Title
Ultraschnelle Intersubband-Photostromresponse in Quantum well Infrarotphotodetektoren
Abstract
We report on a high bandwidth measurement of the transient intersubband photocurrent of a GaAs/AlGaAs multiple quantum-well infrared photodetector (QWIP). The photocurrent is excited via tunable subpicosecond infrared pulses. The response time of the detector has a full width at half-maximum of 18.5 ps and a rise time of 14.5 ps, which is limited by the electrical circuit. The decay time of the photocurrent response exhibits a significant dependence on the applied voltage, with increasing decay times for increasing bias voltages. From the experimental data, we conclude that the intrinsic response time of a QWIP is less than 7 ps.
Author(s)
Ehret, S.
Schneider, H.
Fleissner, J.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Koidl, P.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Böhm, G.
Journal
Applied Physics Letters  
DOI
10.1063/1.119815
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • intersubband photocurrent

  • Intersubband-Photostrom

  • QWIP

  • time resolved photocurrent

  • zeitaufgelöster Photostrom

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