| abstract |
The invention generally provides methods and compositions for planarizing a substrate surface having underlying dielectric materials. Aspects of the invention provide compositions and methods using a combination of low polishing pressures, polishing compositions, various polishing speeds, selective polishing pads, and selective polishing temperatures, for removing barrier materials by a chemical mechanical polishing technique with minimal residues and minimal seam damage. Aspects of the invention are achieved by employing a strategic multi-step process including sequential CMP at low polishing pressure to remove the deposited barrier materials. |