Patent ID: 8586481

Claim:
A method of chemical mechanical polishing (CMP) of a substrate, comprising: exposing a substrate having a plurality of vias filled with an excess conductive material in a face-up orientation to a polishing solution, wherein the excess of conductive material has a deposition profile including areas of high overburden and areas of low overburden, the polishing solution comprising: phosphoric acid; one or more chelating agents; one or more corrosion inhibitors; and one or more oxidizers; forming a passivation layer on the conductive material; providing relative motion between the substrate and the polishing pad to remove the passivation layer from the areas of high overburden of the conductive material to expose portions of the conductive material while the passivation layer remains over the areas of low overburden; and removing conductive material from the exposed portions of the conductive material without the application of electrochemical activity while applying a pressure between the substrate and the polishing pad by use of a carrier head assembly, wherein the pressure is less than 0.5 psi.