Patent ID: 8278223

Claim:
A method for forming a hole pattern, comprising: forming a hard mask layer over an etch target layer; forming pillar patterns having a gap therebetween over the hard mask layer; forming spacer patterns on sidewalls of the pillar patterns; removing the pillar patterns between the spacer patterns; and etching the hard mask layer by using the spacer patterns as etch barriers, wherein the forming of the pillar patterns comprises: stacking first, second and third mask layers over the hard mask layer; forming a first photoresist pattern in a first direction over the third mask layer; etching the third mask layer by using the first photoresist pattern as an etch barrier until the second mask layer is exposed to form an etched third mask layer; removing the first photoresist pattern; forming an anti-reflection layer over an entire structure including the etched third mask layer; forming a second photoresist pattern in a second direction over the anti-reflection layer; forming a third mask pattern in a pillar shape by etching the anti-reflection layer and the etched third mask layer using the second photoresist pattern as an etch barrier until the second mask layer is exposed; removing the second photoresist pattern and the anti-reflection layer; and forming the pillar patterns by etching the first and second mask layers forming, respectively, first and second mask patterns using the third mask pattern as an etch barrier.