Carrier transport properties of monodisperse glassy-nematic oligofluorenes in organic field-effect transistors

Takeshi Yasuda, Katsuhiko Fujita, Tetsuo Tsutsui, Yanhou Geng, Sean W. Culligan, Shaw H. Chen

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

A heptafluorene, F(Pr)5F(MB)2, a dodecafluorene, F(MB)10F(EH)2, and poly(9,9′-dioctylfluorene), PFO, were used to prepare field-effect transistors. Monodomain and polydomain glassy-nematic films as well as glassy-amorphous films were prepared for the measurement of hole mobility. In a monodomain film, the μ value is determined by the chain length in oligofluorene and the persistence length in polyfluorene. Mobility in a polydomain film lies between μ and μ of a monodomain film. Amorphous films possess the lowest mobility of all presumably because of the geometric and energetic disorder. The OFET containing a monodomain glassy-nematic film of F(MB) 10F(EH)2 exhibits a field-effect mobility of 0.012 cm2/Vs with an on/off current ratio of 1.0 × 104, a substantial improvement over a monodomain glassy-nematic film of PFO.

Original languageEnglish
Pages (from-to)264-268
Number of pages5
JournalChemistry of Materials
Volume17
Issue number2
DOIs
Publication statusPublished - Jan 25 2005

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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