Progress with type-II superlattice IR detector arrays

David R. Rhiger, Robert E. Kvaas, Sean F. Harris, Richard E. Bornfreund, Yen N. Thai, Cory J. Hill, Jian V. Li, Sarath D. Gunapala, Jason M. Mumolo

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

22 Citations (Scopus)


We report progress in the development of long wavelength infrared (LWIR) focal plane arrays (FPAs) built on type-II strained layer InAs/GaSb superlattice materials. Work at Raytheon Vision Systems and Jet Propulsion Laboratory has led to successful devices with cutoff wavelengths in the 10 to 12 um range. Pixels have been formed by wet etching and surface passivation by plasma-deposited silicon dioxide. We present test results on arrays hybridized with indium bump bonding to silicon readout integrated circuits, as well as analyses of current-voltage characteristics of individual diodes. In particular, we find that, at temperatures below about 70 K the leakage current is dominated by generationrecombination effects near zero bias and by trap-assisted tunneling in reverse bias. Although other authors have demonstrated imaging for SWIR and MWIR type-II superlattice devices, to our knowledge no one has done so prior to 2006 in the LWIR range. We have obtained both still and video imaging with 256×256 arrays with 30-μm pixels operating at 78 K, having high operability and a cutoff wavelength of 10.5 μm.

Original languageEnglish
Title of host publicationInfrared Technology and Applications XXXIII
Publication statusPublished - 2007 Nov 5
EventInfrared Technology and Applications XXXIII - Orlando, FL, United States
Duration: 2007 Apr 92007 Apr 13

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

All Science Journal Classification (ASJC) codes

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


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