Patent ID: 6479397
Filing Date: 2002-11-12
Classification: H01L

Abstract:
A method for forming an isolation region made of a field oxide film generated by thermal oxidation of an exposed region of the surface of a semiconductor substrate partially covered by an oxidation inhibitor film, comprising:partially covering the surface of said semiconductor substrate with an oxidation inhibitor film; depositing a material for side-wall parts on said oxidation inhibitor film and on an exposed region of said surface revealed through an opening of said oxidation inhibitor film to form side-wall parts at edge portions of said oxidation inhibitor film by a material having the same function as said oxidation inhibitor film; then, removing by a plasma etching process unnecessary portions of said side-wall material deposited on said oxidation inhibitor film and on said exposed region of said semiconductor substrate and leaving intact said side-wall parts at the edge portions of said oxidation inhibitor film; and carrying out a cleaning process on said exposed region on the surface of said semiconductor substrate, revealed through the opening of said oxidation inhibitor film, before performing subsequent heat treatment to generate a field oxide film.