Crystallization in diblock copolymer thin films at different degrees of supercooling

Publication: Research - peer-reviewJournal article – Annual report year: 2009

  • Author: Darko, C.

    Technische Universität München

  • Author: Botiz, I.

    Institut de Chimie de Surfaces et Interfaces, CNRS-UHA (FR)

  • Author: Reiter, G.

    Institut de Chimie de Surfaces et Interfaces, CNRS-UHA (FR)

  • Author: Breiby, D.W.

    Norwegian University of Science and Technology

  • Author: Andreasen, Jens Wenzel

    Solar Energy Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Roth, S.V.

    Deutsches Elektronen-Synchrotron

  • Author: Smilgies, D.-M.

    Cornell University (US), Wilson Laboratory

  • Author: Metwalli, E.

    Technische Universität München

  • Author: Papadakis, C.M.

    Technische Universität München

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The crystalline structures in thin films of polystyrene-b-poly(ethylene oxide) (PS-b-PEO) diblock copolymers were studied in dependence on the degree of supercooling. Atomic force microscopy showed that the crystalline domains (lamellae) consist of grains, which are macroscopic at low and intermediate degrees of supercooling, but of submicrometer size for strong supercooling. Using grazing-incidence wide-angle x-ray scattering, we could determine the grain orientation distribution function which shows that the chain stems are perpendicular to the lamellae at low supercooling, but tilted at intermediate and strong supercooling. These results suggest that, at intermediate and strong supercooling, the crystalline PEO lamellae do not grow homogeneously, but by the formation of small crystallites at the growth front.
Original languageEnglish
JournalPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Publication date2009
Volume79
Issue4
Pages041802
ISSN1539-3755
DOIs
StatePublished

Bibliographical note

Copyright (2009) by the American Physical Society.

CitationsWeb of Science® Times Cited: 7

Keywords

  • Polymer solar cells, Solar energy
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