Patent ID: 8338310

Claim:
A method of forming a line/space pattern, comprising: providing a substrate on which a layer of hard mask material is disposed; forming a plurality of first pattern structures on the layer of hard mask material, the first pattern structures having sidewalls spaced apart from each other in a first direction, and the first pattern structures having linear sections that extend across a first region on the substrate and into a second region; forming a plurality of second pattern structures in the form of sidewall spacers along the sidewalls of the first pattern structures, respectively, such that adjacent ones of the second pattern structures are spaced apart from each other in the first direction; subsequently removing the first pattern structures; forming a first mask that having an opening therethrough that exposes adjacent ones of the second pattern structures and covers others of the second pattern structures in the first region; removing the second pattern structures which are exposed by the first mask in the first region, wherein the second pattern structures covered by the first mask remain; forming a second mask comprising a section that extends across the first region and covers a section of the layer of hard mask material located between respective ones of the remaining second pattern structures in the first region, and wherein the second mask exposes in the first region respective ones of the remaining second pattern structures; forming a hard mask by etching the layer of hard mask material using the second mask and the remaining second pattern structures as an etch mask; and forming a line/space pattern by etching the substrate using the hard mask as an etch mask.