Patent ID: 7998335
Filing Date: 2011-08-16
Classification: B23H,C25D,C25F,H01L

Abstract:
1. A method of polishing a substrate consisting of: providing a substrate comprising at least one metal layer, (ii) contacting the substrate with a polishing composition comprising a liquid carrier and an electrolyte, (iii) applying an electrochemical potential between the substrate and an electrode in contact with the polishing composition, wherein either (a) the applied potential to the substrate is positive and the polishing composition further comprises a reducing agent for the metal or (b) the applied potential to the substrate is negative and the polishing composition further comprises an oxidizing agent for the metal, wherein the positive potential applied to the substrate is about 50 mV to about 800 mV greater than the open circuit potential of the metal layer of the substrate, and the negative potential applied to the substrate is about 100 mV to about 300 mV less than the open circuit potential of the metal layer of the substrate; and (iv) removing at least a portion of the metal layer from a surface of the substrate.