Patent ID: 7316603

Claim:
A chemical mechanical polishing (CMP) composition suitable for use in a tantalum CMP process, which comprises: (a) an abrasive; (b) an organic oxidizer having a standard redox potential (E 0 ) of not more than about 0.5 V relative to a standard hydrogen electrode, the organic oxidizer comprising at least one pi-conjugated ring, the ring including at least one heteroatom directly attached thereto, the at least one heteroatom being selected from the group consisting of N, O, S, and a combination thereof; wherein the organic oxidizer compound is selected from the group consisting of: a compound having at least one quinone moiety, a paraphenylenediamine compound, a phenazine compound, a thionine compound, a phenoxazine compound, phenoxathiin compound, an indigo compound, an indophenol compound, and a combination thereof; and (c) a liquid carrier therefor.