Patent ID: 7030019

Claim:
A semiconductor device fabrication method comprising: forming a first insulating film directly on and contacting a semiconductor substrate, and patterning the first insulating film to form a plurality of projected parts with recessed parts therebetween so that the first insulating film contacts the semiconductor substrate and forms the projected parts and no film is located between the semiconductor substrate and the first insulating film at the projected parts; forming a layer comprising silicon on the projected parts and in the recessed parts; forming a second insulating film on the layer comprising silicon, the second insulating film having a thickness less than the first insulating film; exposing the layer comprising silicon by removing a portion of the second insulating film above projected parts while leaving in place the second insulating film over substantially portions of the recessed parts; and chemically and mechanically polishing the exposed parts of the layer comprising silicon with a polishing slurry while protecting other parts of the layer comprising silicon with the remaining of the second insulating film.