COPPER ELECTROPLATING METHOD

摘要

The method for copper electroplating according to the present invention comprises an aqueous acidic copper plating bath containing a leveler additive which forms copper trenches having a cross-sectional round shape under direct current plating conditions, and at least one reverse current pulse cycle consisting of one forward current pulse and one reverse current pulse wherein the fraction of the reverse charge to the forward charge applied to the substrate in said at least one current pulse cycle ranges between 0.1 to 5 pcnt . The method is particularly suitable for simultaneously filling blind micro vias and plating trenches with a rectangular cross-sectional shape.