Homeotropic Alignment of a Discotic Liquid Crystal Induced by a Sacrificial Layer

Eric Pouzet, Vinciane De Cupere, Christophe Heintz, Jens Wenzel Andreasen, Dag Werner Breiby, Martin Meedom Nielsen, Pascal Viville, Roberto Lazzaroni, Gabin Gbabode, Yves H. Geerts

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A convenient method to induce face-on orientation of an alkoxy phtalocyanine discotic mesogen is described. The alignment is imposed by the confinement of the discotic thin films with a top sacrificial polymer layer that is easily removed by washing with a selective solvent, after thermal annealing. Thin films have been characterized by optical and atomic force microscopy, UV-Vis absorption spectroscopy, and grazing incidence wide angle X-ray scattering. The data converge in showing the central role of the sacrificial layer in promoting alignment with the planar molecules orienting parallel to the substrate in an essentially homeotropic arrangement over large lateral length scales and the persistence of this desirable alignment after removal of the layer.
    Original languageEnglish
    JournalJournal of Physical Chemistry Part C: Nanomaterials and Interfaces
    Volume113
    Issue number32
    Pages (from-to)14398-14406
    ISSN1932-7447
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Polymer solar cells
    • Solar energy

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