Superlattice Materials for Very-Long Wavelength Infrared Detectors (VLWIR)

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: F33615-02-M-5406
Agency Tracking Number: 021ML-0707
Amount: $99,812.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Epir, Ltd.
590 Territorial Drive, Suite B, Bolingbrook, IL, 60440
DUNS: 614747525
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 HyeSon Jung
 Engineer
 (630) 771-0203
 hyeson@epir.com
Business Contact
 Sivalingam Sivananthan
Title: President
Phone: (630) 771-0201
Email: siva@epir.com
Research Institution
N/A
Abstract
"The fabrication of large format, highly sensitive Focal Plane Arrays (FPAs), sensing at very long wavelength in the IR region i.e beyond 15um (VLWIR) is highly desirable for Air Force's space based applications. Currently, only limited types of arrays suchas 256 X 256 Si:As (5-20 um) are available in this IR region. However, these extrinsic detectors suffer from some fundamental limitations, such as low quantum efficiency, relatively low detection sensitivity and low operating temperature. Intrinsicdetectors made from HgTe/CdTe superlattices (SLs) have several advantages over extrinsic detectors such as low tunneling current, low noise and high quantum efficiencies. Compared to bulk HgCdTe, the cut-off wavelength of HgTe/CdTe SLs can be easily tunedto VLWIR by adjusting the layer thickness of HgTe layers. Strained layer HgTe/CdZnTe SLs can even be band structure engineered in order to suppress Auger recombination and impact ionization, which will lead to lower noise and higher operating temperature.Another important advantage of HgTe/CdTe SLs, compared to HgCdTe, is related to the p-type doping which can be achieved without high temperature annealing through arsenic incorporation in CdTe layers. Furthermore these SLs could be grown on Si substrateswhich would pave the way for Megapixel hybrid or possibly monolithic VLWIR FPAs/ Through the design of HgTe/CdTe SL's electronic band structure, detectivity computation and in-situ control

* information listed above is at the time of submission.

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