Interband absorption strength in long-wave infrared type-II superlattices with small and large superlattice periods compared to bulk materials
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 30, 2016
- Source ID
- 10.1063/1.4953035
Entities
People
- D. Donetsky
- G. Belenky
- G. Kipshidze
- I. Vurgaftman
- L. Shterengas
- Stefan P. Svensson
- Wendy L. Sarney
- Yu-Wei Lin
Organizations
- Army Research Office
- Division of Materials Research
- Stony Brook University
- United States Army Research Laboratory
- United States Naval Research Laboratory