Patent ID: 7695347

Claim:
A method for polishing a silicon wafer comprising the step of: mirror-polishing the silicon wafer with a main surface of the silicon wafer being in contact with a polishing pad of non-woven fabric impregnated with resin, wherein a ratio of surface roughness of the polishing pad to compressibility thereof (surface roughness Ra (μm)/ compressibility (%)) is 3.8 or more and 10 or less, wherein the compressibility of the polishing pad is in the range from 2% to 4.5%, and wherein the surface roughness of the polishing pad is in the range from 17μm to 19 μm, and wherein the polishing pad is fabricated by the following steps: preparing a non-woven cloth type polishing cloth of a polyester felt; impregnating the non-woven cloth type polishing cloth with polyurethane; adjusting the impregnation amount of polyurethane so as to regulate compressibility to be on the order of 2%; buffing a surface of the polishing pad with a grindstone with surface finish of about #100 to adjust its surface roughness.