Patent ID: 7390744

Claim:
A method of processing a substrate, comprising: disposing a substrate having patterned feature definitions, a barrier material disposed in the patterned feature definitions, and a tungsten layer formed thereon in a polishing apparatus; polishing the tungsten layer to expose the barrier layer; polishing the barrier layer by a process comprising: providing a barrier polishing composition comprising: between about 1 wt. % and about 10 wt. % of an oxidizer; between about 0.5 wt. % and about 5 wt. % of a chelating agent; between about 0.0001 wt % and about 1 wt % of a polymeric stabilizer; between about 0.3 wt % and about 10 wt % of abrasive particles; a pH between about 1 and about 6; and a solvent; and contacting the substrate to a polishing article; providing relative motion between the substrate and the polishing article; and removing the barrier material from the substrate, wherein the barrier layer is removed at a barrier layer removal rate to tungsten removal rate between about 30:1 and about 80:1.