Melt-processing of conjugated liquid crystals: A simple route to fabricate OFETs

Jonathan C. Maunoury, Jonathan R. Howse, Michael L. Turner

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A simple melt-processing of 5,5'-bis(4-hexylphenyl)-2,2'-bithiophene (DH-PTTP) was analyzed to induce homeotropic alignment of the molecules in the channel of an organic field-effect transistors (OFETs) and to control the thin film morphology. The thermal behavior of DH-PTTP was re-examined using differential scanning calorimetry (DSC) and polarized optical microscopy (POM), and the DSC trace showed three sharp transitions both on cooling and heating. POM observation revealed the appearance of a pronounced striation of the fan-shaped texture that transformed into a mosaic texture on further cooling. Polarized microscopy using OTS-treated glass slides revealed a pseudoisotropic texture on cooling from the isotropic to the SmA phase, consisting with a homeotropic alignment of the molecules in a single monodomain. This homeotropic alignment of liquid-crystalline organic semiconductors appears to be a promising route to control film morphology in the channel of OFETs.
    Original languageEnglish
    Pages (from-to)805-809
    Number of pages4
    JournalAdvanced Materials
    Volume19
    Issue number6
    DOIs
    Publication statusPublished - 19 Mar 2007

    Keywords

    • Cyclic voltammetry
    • Electric current-potential relationship
    • Field effect transistors
    • Hole mobility
    • Liquid crystals (melt-processing of conjugated liq. crystals: a simple route to fabricate OFETs)
    • Electric current carriers (mobility
    • melt-processing of conjugated liq. crystals: a simple route to fabricate OFETs)
    • hexylphenyl bithiophene liq crystal org field effect transistor

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