High-Detectivity Type-II Superlattice Detectors for 6-14 um Infrared Applications

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX12CE52P
Agency Tracking Number: 115507
Amount: $124,859.00
Phase: Phase I
Program: SBIR
Awards Year: 2012
Solicitation Year: 2011
Solicitation Topic Code: S1.04
Solicitation Number: N/A
Small Business Information
SVT Associates
7620 Executive Drive, Eden Prairie, MN, 55344-3677
DUNS: 876868647
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Yiqiao Chen
 Principal Investigator
 (952) 934-2100
 chen@svta.com
Business Contact
 Leslie Price
Title: Contract Administrator
Phone: (952) 934-2100
Email: price@svta.com
Research Institution
 Stub
Abstract
SVT Associates proposes an novel type II superlattice structure to extend the cutoff wavelength and CBIRD SL photo diode structure with unipolar barriers to suppress dark current of SL detectors grown on GaSb substrate. This InAs/GaSb superlattice material system is capable of infrared detection in MWIR/LWIR spectral range, depending on layer thickness of each superlattice period. The goal of this program is to develop high performance type II SL based FPA for 6-14 um detection. Photo detector arrays using this material are of great interest to the NASA for various applications including, in particular, imaging and optical detection, and object discrimination when tracking targets in space or performing astronomical observations. These LWIR photo detectors can also find application to infrared-based chemical identification systems and terrestrial mapping. Applying the dark current suppression and cutoff wavelength extension process to the type II superlattice detectors should result in higher operating temperature, extended cutoff wavelength, and improved quantum efficiency, all important factors that should significantly enhance FPA operation. We intend to characterize the positive effects of proposed techniques in Phase I. In Phase II we will refine the techniques to realize passive-cooled high-performance LWIR FPAs with quantum efficiency larger than 50%.

* information listed above is at the time of submission.

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