Applied Physics Letters · 2016 · 91 citations · 17 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials PhysicsOptical MaterialsAbsorption SpectroscopyElectronic Band StructureElectronic SpectroscopyInfrared Optical MaterialsInfrared SpectroscopyOptical Properties Of SolidsAbsorption SpectraElectronic Absorption SpectraEnergy Band GapInfrared Absorption SpectraLong-wave Infrared MaterialsOptical Absorption In Infrared MaterialsSuperlattice MaterialsSuperlattices
The absorption spectra for the antimonide-based type-II superlattices (SLs) for detection in the long-wave infrared (LWIR) are calculated and compared to the measured data for SLs and bulk materials with the same energy gap (HgCdTe and InAsSb). We include the results for the metamorphic InAsSbx/InAsSby SLs with small periods as well as the more conventional strain-balanced InAs/Ga(In)Sb and InAs/InAsSb SLs on GaSb substrates. The absorption strength in small-period metamorphic SLs is similar to the bulk materials, while the SLs with an average lattice constant matched to GaSb have significantly lower absorption. This is because the electron-hole overlap in the strain-balanced type-II LWIR SLs occurs primarily in the hole well, which constitutes a relatively small fraction of the total thickness.
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Type-II quantum-well lasers for the mid-wavelength infrared
J. R. Meyer, C. A. Hoffman, F. J. Bartoli et al. · Applied Physics Letters · 1995 · 428 citations