Scaling law for responsivity roll-off in quantum-well infrared photodetectors under low-temperature and low-irradiance conditions

Details Scaling law for responsivity roll-off in quantum-well infrared photodetectors under low-temperature and low-irradiance conditions Scaling law for responsivity roll-off in quantum-well infrared photodetectors under low-temperature and low-irradiance conditions

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4823...96l&link_type=abstract

Photonics for Space Environments VIII. Edited by Taylor, Edward W. Proceedings of the SPIE, Volume 4823, pp. 96-103 (2002).

Physics

Scientific paper

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.

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