Unipolar infrared detectors based on InGaAs/InAsSb ternary superlattices
Abstract
Growth and characteristics of mid-wave infrared (MWIR) InGaAs/InAsSb strained layer superlattice (SLS) detectors are reported. InGaAs/InAsSb SLSs, identified as ternary SLSs, not only provide an extra degree of freedom for superlattice strain compensation but also show enhanced absorption properties compared to InAs/InAsSb SLSs. Utilizing In1-yGayAs/InAs0.65Sb0.35 ternary SLSs (y = 0, 5, 10, and 20%) designed to have the same bandgap, a set of four unipolar detectors are investigated. These demonstrate an enhancement in the detector quantum efficiency due to the increased absorption coefficient. The detectors exhibit dark current performance within a factor of 10 of Rule 07 at temperatures above 120 K, and external quantum efficiencies in the 15%–25% range. This work demonstrates ternary SLSs are a potential absorber material for future high performance MWIR detectors.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 11, 2016
- Source ID
- 10.1063/1.4958854
Entities
People
- Charles J. Reyner
- Elizabeth H. Steenbergen
- Gamini Ariyawansa
- John E. Scheihing
- Joshua M. Duran
- Joshua Reding
Organizations
- Air Force Research Laboratory