Patent ID: 8071479

Claim:
A method for chemical mechanical polishing of a substrate, comprising: providing a substrate, wherein the substrate comprises a barrier material in the presence of at least one of an interconnect metal and a low-k dielectric material; providing a chemical mechanical polishing composition, wherein the chemical mechanical polishing composition comprises water; 1 to 40 wt % abrasive having an average particle size of â‰¦100 nm; 0 to 10 wt % oxidizer; 0.001 to 5 wt % quaternary compound; a material having a formula (I): wherein R is selected from C 2 -C 20 alkyl, C 2 -C 20 aryl, C 2 -C 20 aralkyl and C 2 -C 20 alkaryl; wherein x is an integer from 0 to 20; wherein y is an integer from 0 to 20; wherein x+yâ‰§1; wherein the chemical mechanical polishing composition has a pHâ‰¦5; providing a chemical mechanical polishing pad; creating dynamic contact at an interface between the chemical mechanical polishing pad and the substrate; and dispensing the chemical mechanical polishing composition onto the chemical mechanical polishing pad at or near the interface between the chemical mechanical polishing pad and the substrate; wherein at least some of the barrier material is removed from the substrate.