Long Wave IR HgZnTe

Award Information
Agency:
Department of Defense
Branch
Missile Defense Agency
Amount:
$50,000.00
Award Year:
1994
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
26214
Agency Tracking Number:
26214
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
5020 Campbell Blvd., Suite E, Baltimore, MD, 21236
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Sudhir B. Trivedi
(301) 931-7200
Business Contact:
() -
Research Institute:
n/a
Abstract
IR DETECTOR MATERIAL, MERCURY CADMIUM TELLURIDE HAS BEEN THE MOST MATURES AND OFTEN A MATERIAL OF CHOICE FOR ADVACNED INFRARED DETECTION. HOWEVER, IT IS EXTREMELY DIFFICULT TO PRODUCE THE MATERIAL FOR DETECTION AT A WAVELENGTH GREATER THAN 14um. THIS PROBLEM IS DUE TO EXCCESSIVE FUNNELLING AND SURFACE LEAKAGE RELATED TO DARK CURRENTS. IN RECENT YEARS MERCURY ZINC TELLURIDE (MZT) HAS EMERGED AS A SUPERIOR ALTERNATIVE MATERIAL TO MCT WITH RESPECT TO MECHANICAL, CHEMICAL AND THERMAL STABILITY. THIS PROPOSAL DEALS WITH A NOVEL APPROACH TO PREPARE MZT CRYSTALS IN WHICH A) TUNNELING DARK CURRENTS ARE SUPPRESSED SIGNIFICANTLY, AND B) THE MINORITY CARRIER LIFE TIME ARE MAXIMIZED TO ACHIEVE NEAR THEORETICAL AUGER LIMITS. THE PROPOSED MATERIAL WILL HAVE N-TYPE CARRIER CONCENTRATION WELL BELOW 10 (14) CM (-3) AND WILL HAVE GREATLY REDUCED CONCENTRATION OF SHOCKLEY-READ RECOMBINATION CENTERS. THE PROPOSED APPROACH ENTAILS ENNEALING DONOR DOPED MZT SAMPLES UNDER PHSICO-CHEMICAL CONDITIONS SUCH THAT A KNOWN CONCENTRATION OF COMPENSATING Hg VACANCY ACCEPTORS IS INTRODUCED INTO THE SAMPLES. THIS COMPENSATION PROCESS WILL REDUCE N-TYPE CONCENTRATION TO WELL BELOW 10 (14) CM (-3). THE CONDITIONS OF ANNEAL WILL BE OPTIMIZED IN ORDER TO REDUCE THE CONCENTRATION OF FRENKEL DEFECTS WHICH ARE RESPONSIBLE FOR LIMITING CARRIER LIFE TIMES. PHASE I WORK WILL FOCUS ON PRODUCING MZT WAFERS WITH LOW N-TYPE CARRIER CONCENTRATION (<10 (14) CM (-3)) AND CARRIER LIFE TIMES APPROACHING THE AUGER LIMIT. PHASE II WORK WILL BE AIMED AT 1) OPTIMIZING THE PROCESS AND MATERIAL DEVELOPED IN PHASE 1 AND, 2) BUILDING LINEAR AND FOCAL PLANE ARRAYS USING THIS MATERIAL.

* information listed above is at the time of submission.

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