journal article·2015-10-13

Combining Graphoepitaxy and Electric Fields toward Uniaxial Alignment of Solvent-Annealed Polystyrene–b–Poly(dimethylsiloxane) Block Copolymers

Christine C. Kathrein, Wubin Bai, Jean Anne Currivan-Incorvia, George Liontos, Konstantinos Ntetsikas, Apostolos Avgeropoulos, Alexander Böker, Larisa Tsarkova, Caroline A. Ross

Chemistry of Materials· Volume 27· Issue 19
Publisher page

Abstract

We report a combined directing effect of the simultaneously applied graphoepitaxy and electric field on the self-assembly of cylinder forming polystyrene- b -poly(dimethylsiloxane) block copolymer in thin films. A correlation length of up to 20 μm of uniaxial ordered striped patterns is an order of magnitude greater than that produced by either graphoepitaxy or electric field alignment alone and is achieved at reduced annealing times. The angle between the electric field direction and the topographic guides as well as the dimensions of the trenches affected both the quality of the ordering and the direction of the orientation of cylindrical domains: parallel or perpendicular to the topographic features. We quantified the interplay between the electric field and the geometry of the topographic structures by constructing the phase diagram of microdomain orientation. This combined approach allows the fabrication of highly ordered block copolymer structures using macroscopically prepatterned photolithographic substrates.
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Research context

OpenAlex topics: Block Copolymer Self-Assembly · Liquid Crystal Research Advancements · Fluid Dynamics and Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

DWI−Leibniz Institut für Interaktive Materialien, Institute of Physical Chemistry, RWTH Aachen University, Forckenbeckstraße 50, D-52056 Aachen, Germany

Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States

Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, United States

Department of Materials Science Engineering, University of Ioannina, University Campus−Dourouti, 45110 Ioannina, Greece

Lehrstuhl für Polymermaterialien und Polymertechnologien, Fraunhofer-Institut für Angewandte Polymerforschung−IAP, University of Potsdam, D-14476 Potsdam-Golm, Germany

Funding

NSF · Microelectronics Advanced Research Corporation · German Academic Exchange Service · Taiwan Semiconductor Manufacturing Company · DARPA · Verband der Chemischen Industrie

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