Abstract

We describe the design, gas-source MBE growth, and performance of a highly strained photovoltaic intersubband detector with peak responsivity between 3 and 4μm. The absorbing region is composed of a highly strained InGaAs–InAs–InAlAs–AlAs heterostructure with its average lattice constant matched to InP. The detector design is based on a combination of bound-to-bound and bound-to-continuum transitions, which together allow a broad-band photoresponse, comparable to that of detectors with heterogeneous absorption region.

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