Patent ID: 6261158
Filing Date: 2001-07-17
Classification: B24B,H01L

Abstract:
A method of performing chemical-mechanical polishing (CMP) of a wafer using a CMP machine, the CMP being performed on the wafer in fabricating metal interconnects of an integrated circuit, the wafer having formed thereon a dielectric layer patterned to define an interconnect, a barrier layer formed over the dielectric layer and a metal layer formed over the barrier layer, the CMP machine having a platen with a polishing pad mounted thereon, a slurry dispenser and a wafer carrier, the method comprising:disposing the wafer in operative position to the polishing pad of the CMP machine using the wafer carrier;performing a first polish of the wafer with a first slurry using the CMP machine configured with a first set of polishing parameters, wherein the first polish exposes the barrier layer or the dielectric layer beneath the metal layer; andperforming a second polish of the wafer with a second slurry using the CMP machine configured with a second set of polishing parameters, wherein the second polish is performed using the polishing pad and the platen that were used in the first polish, and wherein the second slurry is different from the first slurry.