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Type-II superlattice detector for long-wave infrared imaging

When incorporated into the active layer of a “XBp” detector structure, Type II InAs/GaSb superlattices (T2SLs) offer a high quantum efficiency (QE) and a low diffusion limited dark current, close to MCT Rule 07. Using a simulation tool that was developed to predict the QE as a function of the T2SL period dimensions and active layer stack thickness, we have designed and fabricated a new focal plane array (FPA) T2SL XBp detector. The detector goes by the name of “Pelican-D LW”, and has a format of 640 × 512 pixels with a pitch of 15 μm. The FPA has a QE of 50% (one pass), a cut-off of ~9.5 μm, and operates at 77K with a high operability, background limited performance and good stability. It uses a new digital read-out integrated circuit, and the integrated detector cooler assembly (IDCA) closely follows the configuration of SCD’s Pelican-D MWIR detector.

Keywords: Infrared Detector, LWIR, Focal Plane Array, Bariode, Type II superlattice, XBp, pBp

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  • P. C. Klipstein
  • E. Avnon
  • Y. Benny
  • A. Fraenkel
  • A. Glozman
  • E. Ilan
  • E. Kahanov
  • O. Klin
  • L. Langof
  • Y. Livneh
  • I. Lukomsky
  • M. Nitzani
  • L. Shkedy
  • I. Shtrichman
  • N. Snapi
  • R. Talmor
  • A. Tuito
  • S. Vaserman
  • E. Weiss

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