31 May 2012 High operating temperature midwave quantum dot barrier infrared detector (QD-BIRD)
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Abstract
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, David Z. Ting, Alexander Soibel, Alexander Soibel, Cory J. Hill, Cory J. Hill, Sam A. Keo, Sam A. Keo, Jason M. Mumolo, Jason M. Mumolo, Sarath D. Gunapala, 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); doi: 10.1117/12.920685; https://doi.org/10.1117/12.920685
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