Patent ID: 8304344

Claim:
A method of polishing a microelectronic device substrate on a platen, said method comprising: (a) contacting the substrate on a first platen for sufficient time and under first chemical mechanical polishing (CMP) conditions with a first CMP composition effective for planarizing and removing copper from the substrate; and b) contacting the substrate on the first platen for sufficient time and under second CMP conditions with a second CMP composition comprising the first CMP composition modified by an in-situ addition of at least one additive selected from the group consisting of deionized water, organic solvent, pH adjusting agent, rheology agent, chelating agent, passivating agent, fictive agent, polymeric additive, and combinations thereof, wherein the second CMP composition is effective for removing copper overburden and exposing a barrier material layer, wherein the second CMP composition has a copper static etch rate less than that of the first CMP composition, wherein the rheology agent is selected from the group consisting of modified cellulose derivatives, cellulose ethers, starch derivatives, pectin derivatives, proteins and natural polymers, and wherein the polymeric additive comprises polyvinylpyrrolidone.