NBN TUNNEL JUNCTIONS WITH THERMALLY OXIDIZED SPUTTER

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: N/A
Agency Tracking Number: 15643
Amount: $49,849.00
Phase: Phase I
Program: SBIR
Awards Year: 1991
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Hypres Inc
175 Clearbrook Road, Elmsford, NY, 10523
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Masoud Radparvar
 Principal Investigator
 (914) 592-1190
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THERE HAS BEEN CONSIDERABLE INTEREST IN RECENT YEARS IN FABRICATION OF ALL NIOBIUM NITRIDE SUPERCONDUCTING CIRCUITS. THE HIGH TRANSITION TEMPERATURE OF NBN IS TECHNOLOGICALLY IMPORTANT BECAUSE IT ALLOWS NBN-BASED CIRCUITS TO BE COOLED WITH SMALL AND RELIABLE CLOSED CYCLE REFRIGERATORS (CCR). WE HAVE DEMONSTRATED THE FEASIBILITY OF OPERATING NBN-BASED JOSEPHSON CIRCUITRY IN A CCR ENVIRONMENT. THE FABRICATION OF SUCH CIRCUITS RELIES ON THE DEVELOPMENT OF A PROCESS THAT RELIABLY PRODUCES JOSEPHSON TUNNEL JUNCTIONS. WE HAVE DEVELOPED A PROCESS CAPABLE OF PRODUCING HIGH QUALITY NBN/MGO/NBN DEVICES. OUR PROCESS EXPLOITS THERMALLY OXIDIZED SPUTTER-DEPOSITED MAGNESIUM AS A TUNNEL BARRIER AND PROVIDED A RELATIVELY REPRODUCIBLE MEANS FOR TUNNEL BARRIER FORMATION. HOWEVER, A MAJOR PROBLEM WITH SPUTTER-DEPOSITED MG IS THE PRESENCE OF EXCESSIVE UNOXIDIZED MAGNESIUM. THIS EXCESS MG REACTS WITH NIOBIUM NITRIDE ELECTRODES AND FORMS POOR INTERFACES. USE OF A DIFFUSSION BARRIER BETWEEN NIOBIUM NITRIDE AND MAGNESIUM SHOULD ALLEVIATE THIS PROBLEM. THE GOAL OF THIS RESEARCH IS TO IDENTIFY A SUITABLE DIFFUSION BARRIER.

* information listed above is at the time of submission.

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