Macroscopic Addressable Arrays of Block Copolymer Microdomains*

Generating addressable, macroscopic arrays of nanoscopic elements with perfect lateral order has the potential to revolutionize the microelectronic and storage industries. A novel approach is shown using faceted surfaces of commercially available sapphire wafers to guide the self-assembly of block copolymer (BCP) microdomains into arrays with single crystal textures over the entire wafer surface. Perfectly ordered arrays of BCP microdomains, with areal densities in excess of 10 Terabit/inch$^{2}$, have been produced. The sawtoothed substrate topography provides registered, directional guidance of the BCP self-assembly that is tolerant of surface defects, maintaining the lateral registry and ordering of the microdomains over the entire surface. The approach provides unprecedented areal densities, and opens simple, yet versatile routes to ultrahigh density, addressable systems.