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- W2175748345 abstract "The effect of interface anisotropy on the electronic structure of InAs/GaSb type-II superlattices is exploited in the design of thin-layer superlattices for mid-IR detection threshold. The design is based on a theoretical envelope function model that incorporates the change of anion and cation species across InAs/GaSb interfaces, in particular, across the preferred InSb interface. The model predicts that a given threshold can be reached for a range of superlattice periods with InAs and GaSb layers as thin as a few monolayers. The model also predicts that the absorbance for the 4 micron superlattices is inversely proportional to their period so that smaller period superlattices can be grown proportionately thinner. An added advantage of thin-period superlattices is a smaller hole mass and a lower Auger recombination rate, which should lead to higher detector operating temperatures. A number of superlattices with periods ranging from 50.6 to 21.2 Å for the 4 μm detection threshold were grown by molecular beam epitaxy based on the model design. Low temperature photoluminescence and photoresponse spectra confirmed that the superlattice band gaps remained constant at 330 meV although the period changed by the factor of 2.5. Overall, the present study points to the importance of interfaces as a tool in the design and growth of thin superlattices for mid-IR detectors for room temperature operation." @default.
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- W2175748345 date "2005-09-16" @default.
- W2175748345 modified "2023-10-14" @default.
- W2175748345 title "Interfaces as design tools for short-period InAs/GaSb type-II superlattices for mid-infrared detectors" @default.
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- W2175748345 doi "https://doi.org/10.1117/12.622219" @default.
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