Patent ID: 7312158

Claim:
A method of forming a pattern, comprising: forming a first film and a second film successively on a main surface of a substrate; forming a resist film on the second film; patterning the resist film to form a first pattern having lines; subjecting the first pattern to an etching treatment to narrow a width of the lines of the first pattern; etching the second film by making use of the first pattern having the lines with narrowed width as a mask to form a second pattern having a configuration of the first pattern transferred thereto; forming a third film above the substrate to cover the second pattern; filling a recessed portion of the third film which corresponds to a gap between the lines of the second pattern with a fourth film; and removing, through etching, not only a portion of the third film which is located on opposite sides of the fourth film but also a portion of the first film which is located below the third film to form a third pattern, wherein the first film and the third film are both formed of silicon oxide or silicon nitride, and the second film and the fourth film are both formed of silicon.