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Minority carrier lifetime measurements in Strained Layer Superlattices (SLS)

Award Information
Agency: Department of Defense
Branch: Army
Contract: W911NF-10-C-0012
Agency Tracking Number: A2-4142
Amount: $748,514.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: A09A-T005
Solicitation Number: 2009.A
Solicitation Year: 2009
Award Year: 2010
Award Start Date (Proposal Award Date): 2010-09-16
Award End Date (Contract End Date): 2012-09-15
Small Business Information
25 Health Sciences Drive, Box 111
Stony Brook, NY -
United States
DUNS: 127754385
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 David Westerfeld
 (631) 632-1358
Business Contact
 Laura Sieloff
Title: CFO
Phone: (631) 632-1358
Research Institution
 SUNY Stony Brook
 Dimitri Donetsky
2540 Dole Street Hall 402
Honolulu, HI 96822-
United States

 (631) 632-8411
 Nonprofit College or University

We propose the development of a system for measuring the minority carrier lifetime in strained layer superlattices (SLS). Mid wave infrared (MWIR) and long wave infrared (LWIR) detectors based on SLS technology show promise due to the large and inexpensive focal plane arrays that can be fabricated. The devices are held back though, by excessive dark current, which is related to a poor minority carrier lifetime. This poor lifetime limits SLS detector performance relative to the currently utilized HgCdTe devices. The proposed system will allow for quick, repeatable, and accurate measurement of minority carrier lifetimes so that SLS researchers can make progress in developing these promising devices. The system is based on the optical modulation response technique, but is also capable of time resolved photoluminescence measurements. Excess carriers are produced by fiber coupled semiconductor laser, and excess carrier concentrations as low as 3*10^13 per cm cubed have been obtained.

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

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