Patent ID: 10468540

Abstract:
An AlSb lattice matched barrier infrared detector architecture with the AlSb binary barrier layer enables implementation of strain layer superlattice absorbers with higher absorption coefficients for improved quantum efficiency, presents a simplified structure for epitaxial growth, and enables the utilization of bulk InAs0.815Sb0.185 absorber material with a 5.0 μm cutoff for both single and dual color devices. Such an infrared detector is formed by growing the detector material; bottom contact, 1st absorber layer, AlSb barrier, optional graded layer, 2nd absorber layer, top contact, on top of an AlSb lattice matched buffer layer. Epitaxial growth on the AlSb lattice enables the deposition of unstrained bulk InAs0.815Sb0.185 with a 5.0 μm cutoff, as well as InAs/InAs(x)Sb(1-x) superlattice absorbers with a continuously tunable cutoff from mid-wavelength to long-wavelength infrared.