Patent ID: 6174792
Filing Date: 2001-01-16
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising:forming a gate oxide film on a semiconductor substrate;forming a gate electrode on the gate oxide film;forming a first nitride film on the gate electrode;etching the gate electrode and the first nitride film through a same mask to expose the gate oxide film on the substrate;depositing a second nitride film on at least the gate oxide film and a side wall of the gate electrode for covering the same;forming an opening in the second nitride film by an anisotrophic etching such that the second nitride film is left on the side wall of the gate electrode directly above a part of the gate oxide film, and a part of the gate oxide film is exposed in the opening; andforming a thick oxide film in the gate oxide film at a bottom of the opening by a thermal oxidation so that a thinning portion of the thick oxide film is formed under the gate electrode as an overlapping portion with reference to the second nitride film on the side wall, to thereby form the overlapping portion precisely.