Polymerisable liquid crystalline organic semiconductors and their fabrication in organic field effect transistors

Iain Mcculloch, Weimin Zhang, Martin Heeney, Clare Bailey, Mark Giles, David Graham, Maxim Shkunov, David Sparrowe, Steven Tierney

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

The performance of the semiconducting component in organic field effect transistors (OFETs) is a key parameter in the advancement of organic electronic devices. New semiconductors are required, which can be solution processed, possess high mobility and current modulation, and are stable in ambient conditions. This work provides the first demonstration of working field effect transistor devices fabricated from novel solution processible, polymerisable, small molecule liquid crystalline semiconductors, referred to as reactive mesogens. The design, synthesis, and performance of these materials in transistor devices are reported. The relationship between liquid crystal molecular structure, its corresponding phase behaviour and electrical performance is examined. Molecular design methodology was employed to control the liquid crystalline morphology, in an attempt to optimise organisation and packing. Alignment of the molecules in large homeotropic domains was achieved through surface treatment techniques, and the highly ordered mesophase was preserved by polymerisation of the reactive end groups, creating a crosslinked network.

Original languageEnglish (US)
Pages (from-to)2436-2444
Number of pages9
JournalJournal of Materials Chemistry
Volume13
Issue number10
DOIs
StatePublished - Jan 1 2003

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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