Patent ID: 6162344
Filing Date: 2000-12-19
Classification: C25D,Y10S

Abstract:
A method of depositing a metal layer on a semiconductor wafer comprising:depositing a seed layer on a surface of the wafer;immersing the wafer in a bath containing an electrolytic solution containing metal ions;biasing the wafer negatively with respect to the electrolytic solution so as to create a current flow at a first current density between the electrolytic solution and the wafer and thereby deposit a first plated sublayer electrolytically on the wafer;forming a second plated sublayer over the first plated sublayer by adjusting the conditions within the bath such that a deposition of metal ions is mass transfer limited in an area near an edge of the wafer thereby causing a rate of deposition to be less near the edge of the wafer than in an interior region of the wafer.