NBN TUNNEL JUNCTIONS WITH THERMALLY OXIDIZED SPUTTER

Award Information
Agency:
Department of Defense
Branch
Missile Defense Agency
Amount:
$49,849.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
15643
Agency Tracking Number:
15643
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
175 Clearbrook Road, Elmsford, NY, 10523
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Masoud Radparvar
Principal Investigator
(914) 592-1190
Business Contact:
() -
Research Institute:
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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