Synergistic effect of polymer and oligomer blends for solution-processable organic thin-film transistors

Eunhee Lim, Byung Jun Jung, Masayuki Chikamatsu, Reiko Azumi, Kiyoshi Yase, Lee Mi Do, Hong Ku Shim

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The thin-film morphologies and thin-film transistor (TFT) characteristics of a series of binary blends of poly(9,9′-dioctylfluorene-alt-bithiophene) (F8T2) and α,ω-dihexylquarterthiophene (DH4T) are reported. The blends of F8T2 and DH4T exhibit good solubility and produce TFT devices with better performances than F8T2 and DH4T devices. The 50% DH4T blend device was found to have a hole mobility of 0.011 cm 2 V-1 s-1, which is four times higher than the mobility of the F8T2 device, with a high-on/off ratio of about 105 and a low-off current of 17 pA. The polymer and oligomer domains are phase-separated with large domain size and arranged in characteristic molecular alignments. It was found that carrier transport in the blend systems is mainly controlled by the polymer component, and that the nature of the blended oligomer affects the OTFT performance of the blends.

Original languageEnglish
Pages (from-to)952-958
Number of pages7
JournalOrganic Electronics
Volume9
Issue number6
DOIs
StatePublished - Dec 2008

Keywords

  • Blend
  • Charge carrier mobility
  • Polyfluorene
  • Thin-film transistor
  • Thiophene

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