Guided self-assembly of block copolymer films on interferometrically nanopatterned substrates
Copolymer structures are formed by exposing a substrate with an imaging layer thereon to two or more beams of selected wavelengths to form interference patterns at the imaging layer to change the wettability of the imaging layer in accordance with the interference patterns. A layer of a selected block copolymer is deposited onto the exposed imaging layer and annealed to separate the components of the copolymer in accordance with the pattern of wettability and to replicate the pattern of the imaging layer in the copolymer layer. Stripes or isolated regions of the separated components may be formed with periodic dimensions in the range of 100 nm or less.
1. A nanostructure comprising:
(a) a substrate having a surface;
(b) a patterned imaging layer of self-assembled monolayer on the surface of the substrate having a pattern therein of separated regions with a spacing of the regions of 100 nm or less;
(c) a block copolymer layer on the imaging layer, the block copolymer layer having separated regions of one component of the copolymer that coincide with the separated regions on the imaging layer.
2. The microstructure of claim 1 wherein the thickness of the copolymer layer is 100 nm or less.
3. The nanostructure of claim 1 wherein the substrate is formed of single crystal silicon.
4. The nanostructure of claim 1 wherein the imaging layer is an alkylsiloxane self-assembled monolayer.
5. The nanostructure claim 1 wherein the imaging layer is an octadecyltrichlorosilane self-assembled monolayer.
6. The nanostructure of claim 1 wherein the copolymer layer is a copolymer of polystyrene and poly(methyl methacrylate).