Patent ID: 6884338

Claim:
A method of polishing a copper interconnect and/or film comprising the steps of: a) providing a composition comprising: i) at least one weight percent of at least one bis(perfluoroalkanesulfonyl) imide acid represented by the formula: wherein each R f is independently a perfluorinated alkyl group comprising 1 to 12 carbon atoms that may be cyclic or acyclic, may optionally contain catenated or terminal heteroatoms selected from the group consisting of N, O, and S, and any two R f groups may be linked to form a perfluoroalkylene-containing ring; and ii) solvent; b) providing a substrate comprising at least one surface having at least one copper interconnect and/or film; c) bringing the surface of the substrate and the composition into contact with each other to form an interface; and d) applying a force to promote copper dissolution at the interface.