Patent ID: 8003544
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first film on a semiconductor substrate and forming a second film on the first film formed; processing the formed second film to a first pattern including a plurality of linear parts and end portions formed in an end of each of the linear parts, having a width wider than the linear parts, forming a second pattern including a first opening that traverses the end portions of the first pattern on the second film; etching the second film of the second pattern, exposed in the first opening, so as to divide the end portion into an end portion close to the linear part and an end portion apart from the linear part; forming a third film so as to cover the first film and the second film after the end portion is divided, and etching back the third film so as to form a first side wall formed of the third film on side surfaces of the second film; forming a fourth film so as to cover the first to third films, and etching back the fourth film so as to form a second side wall formed of the fourth film on side surfaces of the first side wall so as to form a closed loop pattern sequentially formed around the divided end portion; and dividing the closed loop pattern, or a closed loop pattern formed in the first film by using the second side wall as a mask.