320×256 infrared focal plane array based on type II InAs/GaSb superlattice with a 12 μm cutoff wavelength

Pierre Yves Delaunay, Binh Minh Nguyen, Darin Hoffman, Manijeh Razeghi*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations


In the past few years, significant progress has been made in the structure design, growth and processing of Type-II InAs/GaSb superlattice photodetectors. Type-II superlattice demonstrated its ability to perform imaging in the middle and long infra-red range, becoming a potential competitor for technologies such as QWIP and HgCdTe. Using an empirical tight-binding model, we developed a superlattice design that matches the lattice parameter of GaSb substrates and presents a cutoff wavelength of 12 urn. Electrical and optical measurements performed on single element detectors at 77 K showed an R0A averaging 13 Ω.cm 2 and a quantum efficiency as high as 54%. We demonstrated high quality material growth with x-ray FWHM below 30 arcsec and an AFM rms roughness of 1.5 Å over an area of 20×20 μm 2. A 320×256 array of 25×25μm 2 pixels, hybridized to an Indigo Read Out Integrated Circuit, performed thermal imaging up to 185 K with an operability close to 97%. The noise equivalent temperature difference at 81 K presented a peak at 270 mK, corresponding to a mean value of 340 mK.

Original languageEnglish (US)
Title of host publicationInfrared Technology and Applications XXXIII
StatePublished - 2007
EventInfrared Technology and Applications XXXIII - Orlando, FL, United States
Duration: Apr 9 2007Apr 13 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherInfrared Technology and Applications XXXIII
Country/TerritoryUnited States
CityOrlando, FL


  • Focal plane array
  • GaSb
  • InAs
  • Infrared
  • LWIR
  • Type-II

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Computer Science Applications


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