Electromigration-reliability improvement of dual damascene...

Semiconductor device manufacturing: process – Coating with electrically or thermally conductive material – To form ohmic contact to semiconductive material

Reexamination Certificate

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C438S629000, C438S666000

Reexamination Certificate

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07087516

ABSTRACT:
Metallic reservoirs in the form of passive or dummy vias are used on interconnects as a source or sink for electromigration material, slowing the build up of electromigration-induced mechanical stress. The passive or dummy vias are disposed in a vertical direction from the interconnect (perpendicular to the plane of the interconnect) to so that the reservoirs do not occupy additional space in the interconnect layer. Both apparatus and method embodiments are described.

REFERENCES:
patent: 5629236 (1997-05-01), Wada et al.
patent: 6124198 (2000-09-01), Moslehi
patent: 6242808 (2001-06-01), Shimizu et al.
patent: 6281586 (2001-08-01), Feurle et al.
patent: 6307268 (2001-10-01), Lin
Hau-Riege, S.P., et al., Experimental Studies of the Reliability of Interconnect Trees, MRS Symposium Proceedings, 612,D10.2.1 (2000), 6 pages.

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