HIGH QUANTUM EFFICIENCY PHOTOCATHODES FOR DETECTION OF 1.06 MICROMETER RADIATION

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$250,000.00
Award Year:
1987
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
4420
Agency Tracking Number:
4420
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Patriots Pk, Bedford, MA, 01730
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Stanley M Vernon
(617) 275-6000
Business Contact:
() -
Research Institute:
n/a
Abstract
LOW-NOISE PHOTOCATHODES ABLE TO DETECT 1.06 MICROMETER - WAVELENGTH RADIATION WITH REASONABLE EFFICIENCY ARE NEEDED FOR SPACEBORN LIDAR SENSOR SYSTEMS UTILIZING ND:YAG LASERS. PHOTOCATHODES WITH 1.06 MICROMETER QUANTUM EFFICIENCIES EXCEEDING 1% HAVE BEEN FABRICATED IN THE PAST BUT ARE NOT COMMERCIALLY AVAILABLE AT PRESENT. SPIRE PROPOSES TO DEVELOP NEGATIVE-ELECTRON-AFFINITY PHOTOCATHODES BASED ON THE USE OF GAINAS ACTIVE LAYERS. WHILE MANY III-V MATERIALS HAVE THE PROPER BANDGAP TO DETECT 1.06 MICROMETER RADIATION, GAINAS HAS ADVANTAGES SUCH AS A PROVEN ABILITY TO DEMONSTRATE HIGH QUANTUM EFFICIENCY AND LONG DIFFUSION LENGTHS IN OTHER APPLICATIONS AND A SIMPLICITY OF DEPOSITION CONTROL NOT FOUND IN THE QUATENARY COMPOUNDS. THE EPITAXIAL STRUCTURE WILL BE GROWN BY METALORGANIC CHEMICAL VAPOR DEPOSITION ON A GAAS SUBSTRATE. PHASE I RESEARCH WILL SEEK TO DEMONSTRATE THE FEASIBILITY OF GROWING GAINAS LAYERS WHICH POSSESS OPTOELECTRONIC PROPERTIES SUITABLE TO THE FABRICATION OF EFFICIENT 1.06 MICROMETER PHOTOCATHODES. FURTHER OPTIMIZATION OF THIS MATERIAL AND THE FABRICATION AND TESTING OF COMPLETE PHOTOCATHODES DEVICES WILL BE THE SUBJECT OF PHASE II.

* information listed above is at the time of submission.

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