This paper reports a study of Shockley-Read-Hall, radiative, and Auger recombination processes in a series of molecular beam epitaxy grown InAs/InAsSb mid-wavelength infrared and long-wavelength infrared type-II superlattice samples using temperature- and excitation -density-dependent photoluminescence measurements, which are carried out from 12 to 77 K with excitation densities from 5 mW/cm2 to 20 W/cm2. A theoretical model is applied to describe the relation between integrated photoluminescence intensity and excitation density. Shockley-Read-Hall, radiative, and Auger recombination coefficients are extracted by fitting this relation. The results show that the Shockley-Read-Hall recombination lifetimes in all InAs/InAsSb type-II superlattice samples are longer than 100 ns, specifically the lifetime in a long-wavelength infrared sample reaches 358 ns at 77 K, in good agreement with the previously reported result of 412 ns measured using time-resolved photoluminescence on a similar sample.
Optical and structural properties of InAs/InAsSb type-II superlattices (T2SL) and their feasibility for mid- and longwavelength
infrared (MWIR and LWIR) photodetector applications are investigated. The InAs/InAsSb T2SL structures
with a broad bandgap range covering 4 μm to 12 μm are grown by molecular beam epitaxy and characterized by highresolution
x-ray diffraction and photoluminescence (PL) spectroscopy. All of the samples have excellent structural
properties and strong PL signal intensities of the same order of magnitude, indicating that non-radiative recombination is
not dominant and the material system is promising for high performance MWIR and LWIR detectors and multiband