Patterned block copolymer structure with oxide lines for line density multiplication
Block copolymers (BCPs) and synthetic infiltration synthesis (SIS) are used to double the line density on a substrate. The BCP comprises first and second interconnected BCP components with a functional group at the junction or interface of the components. After deposition of the BCP on the substrate and annealing, a pattern of parallel stripes of first and second BCP components is formed with a pattern of functional group interfaces between the components. Each of the BCP components is non-reactive with atomic layer deposition (ALD) precursors, while the functional group is reactive with the ALD precursors. The ALD results in the infiltration of inorganic material into the interfaces where the reactive functional groups are located but without affecting the BCP components. After removal of the organic material, a pattern of parallel lines of inorganic material remains with a pitch half that of the stripes of BCP components.
1. A patterned block copolymer (BCP) structure comprising:
a substrate;
a pattern of alternating stripes of a first BCP component and a second BCP component different from the first BCP component on the substrate, the stripes of the first BCP component having a pitch parallel to the substrate and the stripes of the second BCP component having a pitch parallel to the substrate substantially equal to the pitch of the stripes of the first BCP component; and
a pattern of lines of an oxide on the substrate between the stripes of first and second BCP components, the oxide lines having a pitch parallel to the substrate of approximately one-half the pitch of the stripes of the first and second BCP components.
2. The structure of claim 1 wherein the oxide is selected from an aluminum oxide, a titanium oxide, SiO 2 and ZnO.
3. The structure of claim 1 wherein each of the first and second components is selected from polyisoprene (PI), polyethylene, polypropylene, polybutadiene, polystyrene (PS), poly-methylstyrene; acrylonitrile butadiene styrene, polydimethylsiloxane (PDMS) and olyhedral oligomeric silsesquioxane (POSS).
4. The structure of claim 1 wherein the pattern of oxide lines is a periodic pattern selected from generally radial lines, generally concentric rings, and parallel generally straight lines.