Patent ID: 6573027
Filing Date: 2003-06-03
Classification: G03F,H01L

Abstract:
A method of manufacturing a semiconductor device; which comprises the steps of:forming a single layer film of a hard mask material, on a pattern-forming film which is to be used to form a prescribed pattern, and then forming a photoresist film over said film of the hard mask material; carrying out a first exposure using a first mask with a phase shifter and subsequently making a development; etching said film of the hard mask material using the formed resist pattern as a mask; forming a photoresist film so as to cover the formed hard mask pattern; carrying out a second exposure using a second mask with a pattern which enables a portion of the photoresist covering only a required part of said hard mask pattern to remain after the exposure and the development, and subsequently making a development; removing, by means of etching, an unrequired part of the hard mask which is not covered with any portion of said photoresist; and etching said pattern-forming film using the remaining hard mask pattern as a mask.