Semiconductor device manufacturing: process – Coating with electrically or thermally conductive material – To form ohmic contact to semiconductive material
Reexamination Certificate
2007-07-24
2007-07-24
Nhu, David (Department: 2818)
Semiconductor device manufacturing: process
Coating with electrically or thermally conductive material
To form ohmic contact to semiconductive material
C438S621000, C438S570000, C438S931000, C257SE21054, C257SE21163, C257SE21173, C257SE21359, C257SE29104
Reexamination Certificate
active
11053800
ABSTRACT:
A silicon carbide-based device contact and contact fabrication method employ a layer of poly-silicon on a SiC substrate, with the contact's metal layer deposited on top of the poly-silicon. Both Schottky and ohmic contacts can be formed. The poly-silicon layer can be continuous or patterned, and can be undoped or doped to be n-type or p-type. The present contact and method provide excellent contact adhesion, and can be employed with a number of different device types, to provide electrical contacts for Schottky diodes, pn diodes, and transistors, for example.
REFERENCES:
patent: 5270554 (1993-12-01), Palmour
patent: 5679966 (1997-10-01), Baliga
patent: 6979863 (2005-12-01), Ryu
patent: 6998322 (2006-02-01), Das
Koppel, Patrick, Heybl & Dawson
Teledyne Licensing LLC
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