Patent ID: 8877073

Claim:
A method, comprising: forming a block copolymer layer on a substrate, the block copolymer layer having a first domain and a second domain, the first domain associated with a first composition state having a first etch resistance, and the second domain associated with a second composition state; performing a first process on the block copolymer layer, the performing including: altering, by thermal reactivity, chemical reactivity, or both, the first composition state associated with the first domain to a third composition state having a second etch resistance, the second etch resistance greater than the first etch resistance; increasing, based on the altering, an etch selectivity between the first domain and the second domain; removing, based on the increased etch selectivity, portions of the block copolymer layer associated with the first domain to provide one or more recessions; maintaining the second composition state associated with the second domain to provide one or more protrusions; in response to performing the first process, forming a pattern in the block copolymer layer, the pattern including the one or more recessions and the one or more protrusions; and, transferring the pattern in the block copolymer layer to the substrate forming an imprint lithography template.