Patent ID: 7906436
Filing Date: 2011-03-15
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a resist film over a film-to-be-etched formed over a substrate; forming a first opening having a circular geometry in a plan view, and second to fifth openings arranged respectively on four sides of said first opening, in said resist film; and etching said film-to-be-etched while using said resist film as a mask, wherein in said etching said film-to-be-etched, a hardened layer is formed in a region of said resist film fallen between said first opening and each of said second to fifth openings, and said film-to-be-etched is etched while using said hardened layers as a mask, so as to form a contact hole having a rectangular geometry in a plan view in said film-to-be-etched at a position correspondent to said first opening of said resist film.