Patent ID: 8815105
Filing Date: 2014-08-26
Classification: B81C,B82Y,G03F,G11B

Abstract:
1. A method for making an imprinting master mold using directed self-assembly of a block copolymer having polymeric block components, the method comprising: providing a substrate; depositing on the substrate a layer of neutral material having no strong affinity for any component of said block copolymer; forming over the neutral material a resist pattern comprising a first set of parallel bands and a second set of parallel bands non-parallel to and spaced from said first set of bands; modifying the neutral material unprotected by the resist; removing the resist, leaving a pattern of modified neutral material comprising a first set of parallel bars, a second set of parallel bars non-parallel to and spaced from said first set of bars, and an interface strip between said first and second sets of bars, wherein the block copolymer has a bulk period L depositing a layer of said block copolymer material and annealing the deposited block copolymer material to cause phase separation into a first set of parallel stripes of alternating first and second components and a second set of parallel stripes of alternating first and second components non-parallel to and spaced from said first set of stripes, the first component forming on said first and second sets of parallel bars as lamella perpendicular to the substrate surface and on said interface strip of modified neutral material as a lamella oriented parallel to the substrate surface; and removing one of said first and second components, leaving a first set of parallel stripes of the non-removed component and a second set of parallel stripes of the non-removed component non-parallel to and spaced from said first set of stripes of non-removed component.