Patent ID: 6869859
Filing Date: 2005-03-22
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising the steps of: forming a first insulating film in a first region of a semiconductor substrate and a second insulating film in a second region, said second insulating film being formed of the same insulating material as said first insulating film, said second insulating film having a film thickness larger than that of said first insulating film; forming, on said first and second insulating films, a third insulating film formed of an insulating material different from those of said first and second insulating films; patterning said third insulating film; etching said first and second insulating films and said semiconductor substrate by use of said third insulating film as a mask, and forming a first trench in said first region and a second trench in said second region; oxidizing inner surfaces of said first and second trenches; forming a first element-isolating film and a second element-isolating film by filling said first and second trenches with an insulating material; and removing said second insulating film.