Patent ID: 6833295
Filing Date: 2004-12-21
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising:preparing a semiconductor substrate on which a silicon film is piled via a buried oxide film; forming a first insulation film on the silicon film; providing an opening in the first insulation film to expose a part of the silicon film; forming on an inner wall of the opening second insulation film having an etching selection ratio that is different from an etching selection ratio of the first insulation film; carrying out an oxidation process on a surface of the silicon film exposed from the opening, which opening is provided on the inner wall thereof with the second insulation film, to thin the silicon film; forming a conductive film so as to fill in the opening; and eliminating the first insulation film to form a gate electrode having the conductive film and the second insulation film formed on a side wall of the conductive film.