Patent ID: 7943481

Claim:
A method of forming fine patterns, comprising: laminating respective first, second, and third auxiliary layers over an underlying layer; forming first acid diffusion regions spaced apart from each other and each having a first width within the third auxiliary layer, forming second acid diffusion regions spaced apart from each other and each having a second width wider than the first width within the second auxiliary layer, and forming third acid diffusion regions spaced apart from each other and each having a third width narrower than the first width within the first auxiliary layer; forming first auxiliary patterns separated from each other at an interval of the third width, forming second auxiliary patterns on respective first auxiliary patterns and separated from each other at an interval of the second width, and forming third auxiliary patterns on respective second auxiliary patterns and separated from each other at an interval of the first width by removing the first to third acid diffusion regions, respectively; forming a first hard mask pattern between the first auxiliary patterns and forming a second hard mask pattern on sidewalls of each of the second auxiliary patterns under respective third auxiliary patterns; removing the third auxiliary patterns to expose the second auxiliary patterns; removing the second auxiliary patterns and some of the first auxiliary patterns exposed between the first and second hard mask patterns; and removing some of the first auxiliary patterns exposed by the removal of the second auxiliary patterns.