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1 Opto-Electronics Review

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Theoretical modelling of XBn T2SLs InAs/InAsSb/B-AlAsSb mid-wave detector operating below thermoelectrical cooling

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Martyniuk P. , Michalczewski K. , Tsai T. Y. , Wu C. H. , Wu Y. R.

Opto-Electronics Review

2019

tom Vol. 27, No. 3

275--281

The paper reports on the barrier mid-wave infrared InAs/InAsSb (xSb = 0.4) type-II superlattice detector operating below thermoelectrical cooling. AlAsSb with Sb composition, xSb = 0.97; barrier doping, ND < 2×10¹⁶ cm⁻³ leading to valence band offset below 100 meV in relation to the active layer doping, ND = 5×10¹⁵ cm⁻³ was proved to be proper material not introducing extra barrier in valence band in the analyzed temperature range in XBn architectures. The detectivity of the simulated structure was assessed at the level of ∼ 1011 Jones at T ∼ 100K assuming absorber thickness, d = 3 μm. The detector’s architecture for high frequency response operation, τs = 420 ps (T ∼ 77K) was presented with a reduced active layer of d = 1 μm.