Patent ID: 8372304

Claim:
A polishing slurry used in chemical mechanical polishing of a barrier layer and an interlayer dielectric film in a semiconductor integrated circuit, the polishing slurry comprising: an abrasive; an oxidizer; an anticorrosive; an acid; a surfactant; an inclusion compound; and a di-quaternary ammonium salt, wherein the polishing slurry has a pH of less than 5, and wherein the di-quaternary ammonium salt is an ammonium salt represented by the general formula (2): wherein R 3 to R 8 each independently represent an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group or an aralkyl group; two of R 3 to R 8 may be bonded together to form a ring; A represents an alkylene group, a cycloalkylene group, an arylene group or a combination thereof; X − represents a nitrate ion.