We demonstrate the first long-wavelength quantum well infrared photodetector using the lattice-matched n-doped InGaAsP/InP materials system. A 45° prism coupled illumination responsivity of R=0.3 A/W and detectivity of D*λ=1.3×109 cm√Hz/W at T=50 K, for a cutoff wavelength λc=13.2 μm have been achieved.
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Gunapala et al. (1992) studied this question.
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