Patent ID: 7186655

Claim:
A method for manufacturing a semiconductor device, comprising a CMP (Chemical Mechanical Polishing) process which comprises: (a) forming a stack pattern comprising a first conductive material and a hard mask layer on a semiconductor substrate; (b) depositing an oxide film on entire surface of the resultant structure to form an insulating film; (c) selectively etching the insulating film to form a contact hole, so that the stack pattern is positioned in the contact hole; (d) forming a second conductive material on the entire surface of the resultant structure to fill the contact hole; (e) removing the insulating film and the second conductive material until the hard mask film is exposed using a first CMP slurry including about 5 wt % to about 25 wt % SiO 2 as an abrasive; and (f) removing the hard mask film, the second conductive material and the insulating film using a second CMP slurry including about 0.05 wt % to about 0.5 wt % CeO 2 until the conductive material is separated to form a contact plug.