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Title: High operating temperature midwave quantum dot barrier infrared detector (QD-BIRD)
Authors: Ting, David Z.
Soibel, Alexander
Hill, Cory J.
Keo, Sam A.
Mumolo, Jason M.
Gunapala, Sarath D.
Keywords: midwave infrared
high operating temperature
infrared detector
quantum dot
unipolar barrier
Issue Date: 23-Apr-2012
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012.
Citation: SPIE Defense and Security Symposium, Baltimore, Maryland, April 23-27, 2012
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.
Appears in Collections:JPL TRS 1992+

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