Patent ID: 7405163

Claim:
A method of forming a copper wiring line, comprising: providing a workpiece having a resist layer and a metal seed layer, said resist layer having a recessed region and an adjacent field region, said metal seed layer covering at least a portion of said workpiece, including in said recessed region and on said field region; then causing a plating accelerator to become attached to said metal seed layer selectively in said recessed region, with relatively little or no accelerator attached to said metal seed layer in said field region, thereby forming an acceleration region in said recessed region; then plating copper on said workpiece, wherein said accelerator selectively attached in said acceleration region increases a rate of copper plating in said acceleration region relative to a rate of copper plating in said field region; continuing plating copper until a height of plated copper in said acceleration region is higher than a field copper height in said field region; and then after said plating copper, removing metal substantially completely from said field region by removing metal substantially isotropically from said acceleration region and said field region.