Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating selected area
Patent
1991-11-22
1993-10-26
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating selected area
205223, C25D 100
Patent
active
052562743
ABSTRACT:
A process and apparatus for advanced semiconductor applications which involves the selective electrodeposition of metal on a semiconductor wafer is described. The present invention has significant economic and performance advantages over the current state of the art. It addresses problems associated with cleanliness (a major issue with sub-micron processing) , metal thickness uniformity, step coverage and environmental concerns.
A metal with better device performance capabilities compared to the standard aluminum is also employed. The hardware allows the selective deposition to occur without allowing the electrolyte to contact the rear of the wafer or the electrodes contacting the front wafer surface. A virtual anode improves the primary current distribution improving the thickness uniformity while allowing optimization of other film parameters with the remaining deposition variables. Using this process and the associated hardware, metal lines are selectively deposited with contacts or vias completely filled without the need for plasma etching the deposited metal.
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Mayekar Kishor
Niebling John
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