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.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Z. Ting ; Alexander Soibel ; Cory J. Hill ; Sam A. Keo ; Jason M. Mumolo, et al.
"High operating temperature midwave quantum dot barrier infrared detector (QD-BIRD)", Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835332 (May 1, 2012); doi:10.1117/12.920685; http://dx.doi.org/10.1117/12.920685