Patent ID: 7803518
Filing Date: 2010-09-28
Classification: G03F,H01L

Abstract:
1. A method for forming a pattern comprising the steps of: (a) forming a lower hard mask layer and an upper hard mask layer stacked on an etching object including an etching target film at an uppermost level; (b) forming a resist pattern above said upper hard mask layer; (c) etching said upper hard mask layer by using said resist pattern as an etching mask to form an upper hard mask; (d) after said step (c), removing said resist pattern; (e) after said step (d), thinning said upper hard mask by etching; (f) etching said lower hard mask layer by using said thinned upper hard mask as an etching mask to form a lower hard mask; and (g) etching said etching target film by using both said upper hard mask and said lower hard mask as an etching mask.