Patent ID: 6602724
Filing Date: 2003-08-05
Classification: B24B,G01B

Abstract:
A method of chemical mechanical polishing a metal layer on a substrate, comprising:polishing the metal layer on the substrate at a first polishing station with a first polishing surface at a first polishing rate; monitoring polishing at the first polishing station with an eddy current monitoring system; transferring the substrate to a second polishing station when the eddy current monitoring system indicates that a predetermined thickness of the metal layer remains on the substrate; polishing the metal layer on the substrate at the second polishing station with a second polishing surface at a second polishing rate that is lower than the first polishing rate; monitoring polishing of the metal layer at the second polishing station with an optical monitoring system; and halting polishing when the optical monitoring system indicates that a first underlying layer is at least partially exposed.