Patent ID: 7521094

Claim:
A method of forming polymer structures, comprising: applying a solution of a diblock copolymer assembly comprising at least one diblock copolymer that forms lamellae, to a neutral surface of a substrate having a chemical pattern thereon, the chemical pattern comprising alternating pinning and neutral regions that are chemically distinct and have a pitch equal to at least twice that of the diblock copolymer assembly, wherein a first spatial frequency of the chemical pattern is given by the number of paired sets of pinning and neutral regions along a given direction on the substrate, wherein the width of the pinning regions is less than or equal to about one-half of the width of the neutral regions; and forming domains comprising blocks of the diblock copolymer, wherein the domains form by lateral segregation of the blocks, wherein at least one domain has an affinity for the pinning regions and forms on the pinning region, wherein the domains so formed are aligned with the underlying chemical pattern, wherein domains that do not form on the pinning region form adjacent to and are aligned with the domains formed on the pinning regions, such that a structure comprising repeating sets of domains is formed on the chemical pattern with a second spatial frequency given by the number of repeating sets of domains along the given direction, the second spatial frequency being at least twice that of the first spatial frequency.