Patent ID: 6897143

Claim:
A method of manufacturing a semiconductor device, comprising: forming an insulating film on a semiconductor substrate; forming a groove in the insulating film; filling the groove with a wiring material; performing CMP to form a filled wiring layer in the groove; etching the filled wiring layer to thereby form a recess; depositing a cap film over the semiconductor substrate; performing a first polishing operation for the cap film deposited on the insulating film for removal at selectivity of R 1 (=removal rate for the cap film/removal rate for the insulating film); and performing a second polishing operation for the insulating film after removal of the cap film thereon at selectivity of R 2 (=removal rate for the cap film/removal rate for the insulating film), wherein each of the first polishing operation and the second polishing operation is performed by using a slurry having a condition of R 1 >R 2 .