Patent ID: 6589880
Filing Date: 2003-07-08
Classification: G03F,H01L

Abstract:
A method of forming a fine pattern comprising the steps of:forming a work film to be processed on a substrate; forming a hard mask film which has a different etching rate from said work film and serves as a mask to said work film during etching; forming a first resist pattern on said hard mask film by lithography; forming a hard mask pattern by etching a first section of said hard mask film which is not covered with said first resist pattern until the upper surface of said work film is exposed; removing said first resist pattern; forming a second resist pattern on said hard mask pattern by lithography; etching a second section of said hard mask pattern which is not covered with said second resist pattern by isotropic etching, thereby forming a hard mask pattern modified portion; removing said second resist pattern; and etching said work film through said hard mask pattern and hard mask pattern modified portion, which is partially subjected to the isotropic etching, serving as a mask.