Liquid crystalline dialkyl-substituted thienylethenyl [1] benzothieno[3,2-b] benzothiophene derivatives for organic thin film transistors

Ki Hwa Jung, Kyung Hwan Kim, Dong Hoon Lee, Dae Sung Jung, Chan Eon Park, Dong Hoon Choi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

New benzothieno[3,2-b]benzothiophene (BTBT)-based soluble semiconducting molecules have been synthesized through Horner-Emmons coupling reactions using 5-alkylthiophene-2-carbaldehyde and BTBT-diethylphosphonate. The only difference between the two molecules is the length of alkyl chains as a substituent. The molecules are intrinsically thermotropic liquid crystalline (LC) and exhibit good solubility in common organic solvents. The semiconducting properties of the two LC molecules were evaluated in organic thin film transistors (OTFTs). After annealing the samples at the temperature at which liquid crystallinity appears, the TFT device performance improved significantly. The two conjugated molecules 4 and 5 exhibited fairly high charge carrier mobilities of 0.020 cm 2/(Vs) (Vth = -14.5 V, ION/OFF = 1.42 × 105) and 0.023 cm2/(Vs) (Vth = -2.0 V, I ON/OFF = 1.20 × 106), respectively.

Original languageEnglish
Pages (from-to)1584-1593
Number of pages10
JournalOrganic Electronics
Volume11
Issue number9
DOIs
Publication statusPublished - 2010 Sep

Keywords

  • Conjugated molecule
  • Liquid crystallinity
  • Mobility
  • Organic semiconductor
  • Thin film transistor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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