Abstract
A high performance InGaAs/GaAs/AlGaAs superlattice coupled (SC) quantum well infrared photodetector (QWIP) grown on GaAs has been developed for long wavelength infrared detection. The dark I-V and spectral response were measured and analysed on this device. Excellent responsivity and detectivity were obtained for this SC-QWIP. The peak detectivity (D*) and collection quantum efficiency (/spl eta//sub g/) under background limited performance (BLIP) condition were found to be D*/sub BLIP/=8.36/spl times/10/sup 10/ cm-Hz/sup 1/2//W and /spl eta//sub g/=18.8% at /spl lambda//sub p/=10.5 /spl mu/m, V/sub h/=2.5 V, and T=20 K.
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