Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Involving measuring – analyzing – or testing
Reexamination Certificate
2008-05-13
2008-05-13
Tsang-Foster, Susy (Department: 1795)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Involving measuring, analyzing, or testing
C205S101000, C205S296000
Reexamination Certificate
active
10682276
ABSTRACT:
An embodiment of the invention provides a method for reducing within die thickness variations by modifying the concentration of components of a low-acid electroplating solution. For one embodiment, the leveler concentration is increased sufficiently to reduce within die thickness variations to a specified value. For one embodiment of the invention, the leveler and suppressor are increased to reduce within die thickness variations and substantially reduce a plurality of electroplating defects. In such an embodiment the combined concentration of leveler and suppressor is determined to maintain adequate gap fill.
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F. A. Lowenheim, Electroplating, McGraw-Hill Book Co. New York, 1978, pp. 201-202.
Chikarmane Vinay
Dubin Valery M
Zierath Daniel J
Leader William T.
Tsang-Foster Susy
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