Patent ID: 8486611
Filing Date: 2013-07-16
Classification: H01L

Abstract:
1. A method of forming patterns, the method comprising: forming a first and second masking materials over an electrically insulative material, the second masking material being over the first masking material; forming a trench extending through the first and second masking materials and to an upper surface of the electrically insulative material, with said trench passing across a set of electrically conductive lines underlying the electrically insulative material; forming a plurality of openings in the second masking material on opposing sides of the trench, with said openings not passing through the first masking material; the openings being aligned with one another to define a plurality of columns; adjacent openings within each individual column being spaced from one another by a uniform spacing interval; the trench defining an interconnect region; treating surface regions at the bottoms of the openings to render such surface regions selectively wettable by one block of a block copolymer relative to another block of the block copolymer; after said treatment, removing the second masking material to leave the treated surface regions defining an initial part of a two-dimensional array that extends across the first masking material and the electrically insulative material, the treated surface regions of the initial part of the two-dimensional array being on opposing sides of the trench; forming the block copolymer over the first masking material and the electrically insulative material, and then inducing self-assembly of the block copolymer in an epitaxial process in which a pattern from the treated surface regions is propagated through the self-assembled block copolymer to form the two-dimensional array from first domains of the self-assembled block copolymer; with the two-dimensional array extending across the trench; and removing the first domains to leave openings extending to the electrically insulative material in the interconnect region.