Patent ID: 7857986

Claim:
A chemical mechanical polishing (CMP) method comprising: supplying a slurry comprising a ceria-based abrasive having a concentration of 0.001-10 percent by weight and a silica-based abrasive having a concentration of 1-24 percent by weight to a polishing pad of a CMP apparatus; and first polishing a target film on a semiconductor substrate on the polishing pad, wherein supplying the slurry comprises supplying the ceria-based abrasive to the polishing pad, supplying the silica-based abrasive to the polishing pad substantially simultaneously with the supply of the ceria-based abrasive, and mixing the ceria-based abrasive and the silica-based abrasive on the polishing pad to provide the slurry on the polishing pad, and wherein the ceria-based abrasive is supplied to a position closer to the center of the polishing pad than the silica-based abrasive, and is mixed with the silica-based abrasive on the polishing pad.