Type II superlattice photodetectors for MWIR to VLWIR focal plane arrays

Manijeh Razeghi*, Y. Wei, A. Hood, D. Hoffman, B. M. Nguyen, P. Y. Delaunay, E. Michel, Ryan P McClintock

*Corresponding author for this work

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

32 Scopus citations


Infrared sensors utilizing Type II superlattice structures have gained increased attention in the past few years. With the stronger covalent bonds of the III-V materials, greater material uniformity over larger areas is obtained as compared to the weaker ionic bonding of the II-VI materials. Results obtained on GaSb/InAs Type II superlattices have shown performance comparable to HgCdTe detectors, with the promise of higher performance due to reduced Auger recombination and dark current through improvements in device design and material quality. In this paper, we discuss advancements in Type II IR sensors that cover the 3 to >30 μm wavelength range. Specific topics covered will be device design and modeling using the Empirical Tight Binding Method (ETBM), material growth and characterization, device fabrication and testing, as well as focal plane array processing and imaging. We demonstrate high quality material with PL linewidths of ∼20 meV, x-ray FWHM of 20-40 arcsec, and AFM rms roughness of ∼1.2 Å over a 20 μm×20 μm area. Negative luminescence at 10 μm range is demonstrated for the first time. Device external quantum efficiency of >30%, responsivity of ∼2A/W, and detectivity of 10 11 Jones at 77K in the 10 μm range are routinely obtained. Imaging has been demonstrated at room temperature for the first time with a 5 μm cutoff wavelength 256×256 focal plane array.

Original languageEnglish (US)
Title of host publicationInfrared Technology and Applications XXXII
Volume6206 I
StatePublished - Aug 29 2006
EventInfrared Technology and Applications XXXII - Kissimmee, FL, United States
Duration: Apr 17 2006Apr 21 2006


OtherInfrared Technology and Applications XXXII
Country/TerritoryUnited States
CityKissimmee, FL


  • Focal plane array
  • GaSb
  • InAs
  • Infrared
  • LWIR
  • MWIR
  • Photodiode
  • Superlattice
  • Type II

ASJC Scopus subject areas

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


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