Patent ID: 6461977
Filing Date: 2002-10-08
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming on a semiconductor substrate a first interconnection pattern and a second interconnection pattern adjacent to each other, each with a first oxide film formed thereon; forming a second oxide film on said semiconductor substrate to cover sidewalls of said first and second interconnection patterns, sidewalls of said first oxide film and an upper surface of said first oxide film; forming a silicon nitride film as an etching stopper to cover said first and second interconnection patterns with said first and second oxide films interposed therebetween; forming an interlayer insulating film on said semiconductor substrate to cover said silicon nitride film; etching, using a resist pattern, a portion of said interlayer insulating film located between said first interconnection pattern and said second interconnection pattern until a surface of said silicon nitride film is exposed, to form a contact hole; removing said resist pattern; and etching in a self-aligned manner a bottom of said contact hole, to expose a surface of said semiconductor substrate.