Designing solution-processable air-stable liquid crystalline crosslinkable semiconductors

Iain McCulloch*, Clare Bailey, Kristijonas Genevicius, Martin Heeney, Maxim Shkunov, David Sparrowe, Steven Tierney, Weimin Zhang, Rodney Baldwin, Theo Kreouzis, Jens W. Andreasen, Dag W. Breiby, Martin M. Nielsen, A. N. Cammidge, S. J. Picken

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Organic electronics technology, in which at least the semiconducting component of the integrated circuit is an organic material, offers the potential for fabrication of electronic products by low-cost printing technologies, such as ink jet, gravure offset lithography and flexography. The products will typically be of lower performance than those using the present state of the art single crystal or polysilicon transistors, but comparable to amorphous silicon. A range of prototypes are under development, including rollable electrophoretic displays, active matrix liquid crystal (LC) displays, flexible organic light emitting diode displays, low frequency radio frequency identification tag and other low performance electronics. Organic semiconductors that offer both electrical performance and stability with respect to storage and operation under ambient conditions are required. This work describes the development of reactive mesogen semiconductors, which form large crosslinked LC domains on polymerization within mesophases. These crosslinked domains offer mechanical stability and are inert to solvent exposure in further processing steps. Reactive mesogens containing conjugated aromatic cores, designed to facilitate charge transport and provide good oxidative stability, were prepared and their liquid crystalline properties evaluated. The organization and alignment of the mesogens, both before and after crosslinking, were probed by grazing incidence wide-angle X-ray scattering of thin films. Both time-of-flight and field effect transistor devices were prepared and their electrical characterization reported.

Original languageEnglish (US)
Pages (from-to)2779-2787
Number of pages9
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume364
Issue number1847
DOIs
StatePublished - Oct 15 2006
Externally publishedYes

Keywords

  • Field effect transistor
  • Liquid crystal
  • Organic semiconductor

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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