3 May 2010 Optimization of MWIR type-II superlattices for infrared detection
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Abstract
Type II superlattices (SLs) offer a broad range of design degrees of freedom to help optimize their properties for infrared detection. Under the AFRL STEPS contract, we focus on mid-wavelength infrared (MWIR; 2-5 μm bandpass) Type II structures with two-layer InAs/GaInSb and four-layer "W-structure" InAs/GaInSb/InAs/AlInGaAsSb SL periods. We consider details of the electronic band structures that reduce Auger recombination rates in p-type SLs specifically by affecting the density of final states available to one of the involved carriers. This work assesses the potential impact of final state optimizations on 5 μm band gap SLs in the 200-225 K operating temperature range.
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C. Grein, M. E. Flatté, "Optimization of MWIR type-II superlattices for infrared detection", Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76601L (3 May 2010); doi: 10.1117/12.851862; https://doi.org/10.1117/12.851862
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