Patent ID: 8062981

Claim:
A method of forming a fine pattern of a substrate, comprising: forming, as a first hard mask, a plurality of first line patterns on an etch target layer; forming a first layer on sidewalls of the first hard mask, such that the first layer delimits a recess between a pair of the first line patterns in a cell array region of a semiconductor device; forming, as a second hard mask, a plurality of second line patterns within the recess, such that each of the second line patterns is disposed between adjacent ones of a respective pair of the first line patterns; etching the first layer using the first line patterns and the second line patterns as an etch mask, to thereby expose that part of the etch target layer disposed between the first line patterns and the second line patterns; and patterning the etch target layer using the first hard mask and the second hard mask, to thereby form a fine pattern in the cell array region of the semiconductor device.