Patent ID: 7842193
Filing Date: 2010-11-30
Classification: C09G,C09K,H01L

Abstract:
1. A polishing method comprising polishing a barrier metal material on an interlayer insulation material, the polishing using a polishing liquid, wherein the polishing liquid has a pH of from 2.0 to 6.0 and comprises an aqueous solution containing a compound represented by the following formula ( polishing particles containing silicon oxide and dispersed in the aqueous solution, the content of the polishing particles in the polishing liquid being from 0.01 to 20% by mass, and a heterocyclic compound selected from the group consisting of 1,2,3,4-tetrazole, 5-amino-1,2,3,4-tetrazole, 5-methyl-1,2,3,4-tetrazole, 1,2,3-triazole, 4-amino-1,2,3-triazole, 4,5-diamino-1,2,3-triazole, 1,2,4-triazole, 3-amino-1,2,4-triazole, 3,5-diamino-1,2,4-triazole and benzotriazole, the content of the heterocyclic compound in the polishing liquid being from 0.01 to 0.10% by mass: wherein 1≦m+n≦4; R wherein the electric conductivity of the polishing liquid is from 0.2 to 8.0 mS/cm.