Patent ID: 6835294
Filing Date: 2004-12-28
Classification: C25D,H05K

Abstract:
A method for plating copper comprising the steps of: contacting a substrate to be plated with a copper plating bath comprising a soluble anode and an acid copper electroplating solution which comprises a compound having the structure â€”Xâ€”Sâ€”Yâ€”, where X and Y are atoms selected independently from the group consisting of hydrogen, carbon, sulfur, and nitrogen, and wherein X and Y can be the same only when both are carbon, applying a current density to the copper electroplating solution to deposit copper on the substrate, and subjecting the copper electroplating solution to dummy electrolysis using an insoluble anode to maintain a compound of the formula â€”Xâ€”Sâˆ’ or â€”Yâ€”Sâˆ’ in an amount of no more than 2.0 &mgr;mol/L.