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We report on a systematic study of a set of GaAs/AlGaAs p-type quantum well infrared photodetectors with varying barrier heights. The detector cutoff wavelength decreases with increasing barrier height. Experimental photoresponse spectra are in good agreement with calculated ground-state to continuum absorption spectra, based on a multiband envelope-function model. The measured dark current decreases with increasing barrier height. An estimate of the low-field dark current gives good agreement with the measured dark current.
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Liu et al. (1998) studied this question.
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