Patent ID: 7846502

Claim:
A method for preparing a line/space array comprising: obtaining a substrate having an energetically neutral surface layer, the energetically neutral surface layer comprising a first topographic “phase pinning” pattern and a second topographic “guiding” pattern; the first topographic “phase pinning” pattern comprising a mesa having an edge; the second topographic “guiding” pattern comprising a trough, the trough having at least one open end; wherein the distance between the at least one open end of the trough and the edge of the mesa is about 0.5 P to about 1.0 P, and wherein P refers to the lamellar domain period of a di-block copolymer; providing a self-assembling di-block copolymer; coating the self-assembling di-block copolymer on the energetically neutral surface to obtain a coated substrate, wherein the edge pins one block of the di-block copolymer; annealing the coated substrate to obtain a polymer structure consisting essentially of self-assembled lamellar micro-domains of di-block copolymer; wherein the micro-domains are controlled in both alignment and registration (lateral position in the trough); and removing one type of block of the self-assembled lamellar micro-domains to obtain a pattern of alternating lines and spaces, wherein the pattern comprises the line/space array.