Patent ID: 7854777
Filing Date: 2010-12-21
Classification: C09G,H01L

Abstract:
1. A polishing method comprising supplying a polishing compound to a polishing pad on a polishing platen, bringing a surface to be polished into contact with the polishing compound, and relatively moving the surface to be polished and the polishing pad, wherein a substrate on which a wiring metal film, a barrier film and an insulating film are formed is polished and wherein the polishing compound comprises (A) 4 to 10 mass % of silica particles, (B) 1 to 5 mass % of an oxidizing agent selected from the group consisting of hydrogen peroxide, persulfate, or a combination thereof, (C) 0.001 to 0.2 mass % of a compound represented by the Formula 1  where R is a hydrogen atom or a methyl group, (D) 60 to 98 mass % of water, (E) 0.1 to 5 mass % of at least one substance selected from the group consisting of ethylene glycol, propylene glycol methyl ether, (F) 0.01 to 1 mass % of nitric acid, (G) an alkaline compound comprising a member selected from the group consisting of KOH, and ammonia, present in an amount such that the composition has a pH in a range of 3 to 4 and wherein the composition has a removal rate of Ta of from 30 to 160 nm and which is higher than that of Cu removal rate of 30 to 150 nm when applied to a wiring metal film, a barrier film and an insulating film containing a film of Ta and a film of Cu.