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High-speed infrared detection by uncooled photovoltaic quantum well infrared photodetectors

Hochgeschwindigkeits-IR-Detektion mit ungekühlten photovoltaischen Quantum-Well-IR-Photodetektoren


Applied Physics Letters 70 (1997), No.12, pp.1602-1604 : Ill.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
GaAs/AlGaAs; photovoltaic; Photovoltaik; time-dependent photocurrent; zeitabhängiger Photostrom

We have investigated the temporal response of uncooled photovoltaic quantum well infrared photodetectors (PV QWIP) using 2 ps pulses from a free electron laser. We measured rise and fall times of 8 ps and 63 ps, respectively. We have also determined the temperature dependence of the voltage responsivity and resistance of the sample from 70 K to 300 K. Based on these measurements, we discuss the figures of merit of PV QWIPs in a high-bandwidth 50 ohm environment.