InP-based quantum-well infrared photodetectors

Physics

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Scientific paper

We demonstrate the first long wavelength quantum well infrared photodetectors (QWIPs) using lattice matched n-doped In(subscript 0.47)As/InP and n-doped 1.3 micrometers InGaAsP/InP materials systems. The responsivity of In(subscript 0.52)Ga(subscript 0.47)As/InP detectors has been found to be larger than that for similar GaAs/Al(subscript x)Ga(subscript 1 - x)As detectors. In addition we demonstrate the first p-doped In(subscript 0.53)Ga(subscript 0.47)As/InP QWIPs. This detector has the shortest wavelength response, (lambda) (subscript p) equals 2.7 micrometers , ever achieved in a QWIP and operates at normal incidence.

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