Patent ID: 8142986
Filing Date: 2012-03-27
Classification: H01L

Abstract:
1. A method of forming fine patterns of a semiconductor device, the method comprising: forming a mold mask pattern block by arranging a plurality of mold mask patterns parallel to each other within a cell block on a substrate comprising a film which is to be etched, wherein each of the mold mask patterns comprises a first portion extending in a first direction and a second portion which is integrally formed with the first portion and extends in a second direction different from the first direction; forming a first mask layer covering sidewalls and an upper surface of each of the plurality of mold mask patterns, on the substrate, wherein the first mask layer comprises two vertical extensions covering sidewalls of adjacent mold mask patterns by being located between the adjacent mold mask patterns and a horizontal extension formed on the film to be etched between the two vertical extensions so that the two vertical extensions are connected to each other, wherein after the first mask layer is formed, recesses having widths each defined by two vertical extensions connected to a horizontal extension of the first mask layer are formed on the horizontal extension between adjacent mold mask patterns of the plurality of mold mask patterns; and forming first mask patterns, comprising: partially removing the first mask layer so that a first area of the first mask layer remains and a second area of the first mask layer is removed, wherein the first area of the first mask layer covers sidewalls of adjacent mold mask patterns from among the plurality of mold mask patterns by being located between the adjacent mold mask patterns, and the second area of the first mask layer covers portions of the sidewalls of the plurality of mold mask patterns, the portions corresponding to an outermost sidewall of the mold mask pattern block; forming a gap-fill protection film which fills the recesses by being located between the two adjacent mold mask patterns, after the first mask layer is formed; removing a portion of the first mask layer, which is not covered by the gap-fill protection film; forming mask spaces each having a first depth between the mold mask patterns and the gap-fill protection film, by partially removing the vertical extensions of the mask layer starting from upper surfaces of the vertical extensions, when the gap-fill protection film remains in the recesses; and forming upper mask patterns within the mask spaces.