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Proceedings Paper

Scaling law for responsivity roll-off in quantum-well infrared photodetectors under low-temperature and low-irradiance conditions
Author(s): Dang T. Le; Christian P. Morath; Dan Hong Huang; Hillary E. Norton; David A. Cardimona
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Paper Abstract

The peak responsivity of quantum-well infrared photodetectors (QWIPs) is known to decrease or "roll-off" to a lower plateau value as the frequency of an incoming time-varying photon irradiance increases. The time constant associated with the roll-off frequency depends on the amplitude of the applied DC bias, the incoming irradiance, and the device temperature. In this paper we demonstrate the scaling law for the responsivity roll-off and use it to estimate the quantum-well capacitance by first measuring the roll-off frequency as a function of bias and optical flux and then measuring the device dynamic resistance under similar conditions. The slope of the scatter plot of the roll-off angular frequency versus the inverse dynamic resistance is related to the quantum-well capacitance. Using this approach, we estimate the quantum-well capacitance in a fifty-well, Al0.3Ga0.7As/GaAs QWIP pixel of area 2.44 x 10-4 cm-2 to be ~ 1.22pF at 50 K.

Paper Details

Date Published: 11 November 2002
PDF: 8 pages
Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); doi: 10.1117/12.453516
Show Author Affiliations
Dang T. Le, Air Force Research Lab. (United States)
Christian P. Morath, Air Force Research Lab. (United States)
Dan Hong Huang, Air Force Research Lab. (United States)
Hillary E. Norton, Air Force Research Lab. (United States)
David A. Cardimona, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 4823:
Photonics for Space Environments VIII
Edward W. Taylor, Editor(s)

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