Patent ID: 6368981
Filing Date: 2002-04-09
Classification: B24B,H01L

Abstract:
A method of manufacturing a semiconductor device, wherein: after a trench for a wiring line is formed in an insulation film covering a surface of a semiconductor substrate, a first and a second metal film are subsequently formed over an entire surface of said insulation film including said trench; and, said first and said second metal film formed on a top surface of said semiconductor substrate through said insulation film are subsequently polished by a chemical mechanical polishing process to form a buried wiring line, said method of manufacturing said semiconductor device comprising:a first polishing step for polishing said second metal film in a condition in which a polishing liquid is supplied to a polishing platen, and said semiconductor substrate having its surface forced against said polishing platen is brought into press-contact with a first flexible element which is large in deformation; and a second polishing step for polishing said first metal film in a condition in which a polishing liquid is supplied to said polishing platen, and said semiconductor substrate having its surface forced against said polishing platen is brought into press-contact with a second flexible element which is small in deformation.