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31 May 2012 High operating temperature midwave quantum dot barrier infrared detector (QD-BIRD)
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The nBn or XBn barrier infrared detector has the advantage of reduced dark current resulting from suppressed Shockley-Read-Hall (SRH) recombination and surface leakage. High performance detectors and focal plane arrays (FPAs) based on InAsSb absorber lattice matched to GaSb substrate, with a matching AlAsSb unipolar electron barrier, have been demonstrated. The band gap of lattice-matched InAsSb yields a detector cutoff wavelength of approximately 4.2 μm when operating at ~150K. We report results on extending the cutoff wavelength of midwave barrier infrared detectors by incorporating self-assembled InSb quantum dots into the active area of the detector. Using this approach, we were able to extend the detector cutoff wavelength to ~6 μm, allowing the coverage of the full midwave infrared (MWIR) transmission window. The quantum dot barrier infrared detector (QD-BIRD) shows infrared response at temperatures up to 225 K.
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David Z. Ting, Alexander Soibel, Cory J. Hill, Sam A. Keo, Jason M. Mumolo, and Sarath D. Gunapala "High operating temperature midwave quantum dot barrier infrared detector (QD-BIRD)", Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835332 (31 May 2012);

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