AlGaAsSb/InGaAsSb on GaSb, Infrared, Separate Absorption and Multiplication, Avalanche Photodiodes

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 32361
Amount: $294,896.00
Phase: Phase II
Program: SBIR
Awards Year: 1997
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Solor Park, Newark, DE, 19716
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Thomas A. Goodwin
 (302) 366-0400
Business Contact
Phone: () -
Research Institution
AstroPower proposes to develop high performance, room temperature, mass-producible, low-cost infrared detectors using liquid-phase heteroepitaxy of lattice-matched InGaAsSb and AlGaAsSb on GaSb substrates. The structure of these detectors will be a Separate Absorption and Multiplication Avalanche Photodiode (SAM-APD). This structure has proven to be an effective means of producing large gain in the absence of large dark current. With proper composition InGaAsSb can be prepared with band gap adjustable in wavelength from 1.7 to 4.5 mm. The major advantage of using quaternary systems over binary and ternary compounds is the ability to vary the band gap while still providing lattice matched growth to the substrate material. Another expected advantage is that this detector structure will have good detectivity at room temperature while most commercially available detectors need cooling to liquid nitrogen temperatures. AstroPower has previous experience in the growth of these material systems. Liquid phase epitaxy has routinely provided quality III-V detectors and photovoltaic cells with the highest optical-to-electrical energy conversion efficiency, and has significant cost advantages over other forms of epitaxy. Feasibility of this approach will be demonstrated by the end of the Phase I program.

* Information listed above is at the time of submission. *

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