Patent ID: 8071467

Claim:
A method of forming a pattern, comprising: forming a block copolymer assembly over a substrate, the block copolymer assembly having first and second subunits arranged in a pattern of at least two domains; one of the domains being a first matrix formed from the second subunits, and one of the domains being first features formed from the first subunits; the first features being entirely contained within the first matrix; exposing the block copolymer to first conditions that cause the first features to be disrupted so that a surface of the block copolymer comprises both the first and second subunits; after disrupting the first features, exposing the surface to metal-containing material to couple metal to the first subunits; the metal coupling to the first subunits selectively relative to the second subunits; exposing the block copolymer to second conditions that cause the block copolymer to redistribute such that the metal migrates from the surface into second features within a second matrix; the second matrix comprising the second subunits and the second features comprising the first subunits; the second features being entirely surrounded by the second matrix along at least one cross-section; removing at least some of the block copolymer to form a patterned mask containing the metal from the second features; and transferring a pattern defined by the patterned mask into the substrate with one or more etches.