Patent ID: 7576010

Claim:
A method of forming a fine pattern on a substrate, comprising: forming a first line on an etch target layer; forming an anti-reflective layer on the first line; forming a photoresist pattern on the anti-reflective layer; anisotropically etching the anti-reflective layer using the photoresist pattern as an etch mask to form a plurality of anti-reflective patterns; anisotropically etching the first line using the anti-reflective patterns as an etch mask to form a first hard mask pattern comprising a plurality of first line patterns formed on the etch target layer in a first direction and having a first pitch; forming a third layer on sidewalls and an upper surface of the first hard mask pattern, such that the third layer includes a top surface having a recess formed between two adjacent first line patterns; forming a second hard mask pattern comprising a plurality of second line patterns each extending in the first direction within the recess; anisotropically etching the third layer using the first line patterns and the second line patterns as an etch mask to selectively expose the etch target layer between the first line patterns and the second line patterns; and, anisotropically etching the etch target layer using the first hard mask pattern and the second hard mask pattern as an etch mask.