Minority Carrier Lifetime Measurements in Strained Layer Superlattices

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: W911NF-09-C-0120
Agency Tracking Number: A09A-005-0131
Amount: $99,979.00
Phase: Phase I
Program: STTR
Awards Year: 2009
Solicitation Year: 2009
Solicitation Topic Code: A09A-T005
Solicitation Number: 2009.A
Small Business Information
1405 4th Ave NW, Suite 345, Ardmore, OK, 73401
DUNS: 159048698
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: Y
Principal Investigator
 Daniel Johnstone
 Senior Research Scientist
 (405) 227-9414
 johnstone@amethystresearch.com
Business Contact
 Sallie Reddy
Title: President
Phone: (405) 227-9414
Email: admin@amethystresearch.com
Research Institution
 Texas State University
 Thomas H Myers
 RF Mitte Building, 3206
Texas State University
San Marcos, TX, 78666
 (512) 245-6711
 Nonprofit college or university
Abstract
Type II strained layer superlattice (SLS) p-n diode arrays fabricated on domestic-source GaSb substrates are a promising route to meet the critical need within DoD for large area, large format array infrared detectors. However, current SLS material quality is limiting detector performance. A quantitative, cost effective and trusted evaluation technique for measuring the SLS minority carrier lifetime is critical to establishing a comprehensive development program for the SLS system. In Phase I we will develop an automated, variable temperature photoconductance decay (PCD) lifetime measurement system capable of measuring lifetimes in the range of 1 ns (existing SLS materials quality) up to 25 ms (anticipated long-term SLS quality). The system will also permit synergistic use of equipment components to allow various other techniques to be incorporated on a common platform, such as current transient spectroscopy and photo induced current transient spectroscopy. The appropriate combination with PCD lifetime measurements will provide an unprecedented, coordinated technique for materials evaluation. The program brings together teams from Amethyst Research, Texas State University and IntelliEPI. In Phase II a system will be built and fully evaluated to establish a sustainable product platform. The final product will comprise an Integrated Narrow-Bandgap Lifetime Assessment Platform (INLAP).

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

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