title: Local Control of Microdomain Orientation in Diblock Copolymer Thin Films with Electric Fields
abstract: Local control of the domain orientation in diblock copolymer thin films can be obtained by the application of electric fields on micrometer-length scales. Thin films of an asymmetric polystyrene-polymethylmethacrylate diblock copolymer, with cylindrical polymethylmethacrylate microdomains, were spin-coated onto substrates previously patterned with planar electrodes. The substrates, 100-nanometer-thick silicon nitride membranes, allow direct observation of the electrodes and the copolymer domain structure by transmission electron microscopy. The cylinders aligned parallel to the electric field lines for fields exceeding 30 kilovolts per centimeter, after annealing at 250&deg;C in an inert atmosphere for 24 hours. This technique could find application in nanostructure fabrication.
authors.affiliation: T. L. Morkved, M. Lu, A. M. Urbas, E. E. Ehrichs, H. M. Jaeger, James Franck Institute and Department of Physics, University of Chicago, Chicago, IL 60637, USA. P. Mansky and T. P. Russell, IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA.
authors.initials: TL
authors.lastname: Morkved
authors.initials: M
authors.lastname: Lu
authors.initials: AM
authors.lastname: Urbas
authors.initials: EE
authors.lastname: Ehrichs
authors.initials: HM
authors.lastname: Jaeger
authors.initials: P
authors.lastname: Mansky
authors.initials: TP
authors.lastname: Russell