Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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New Semiconducting Multi-branched Conjugated Molecules Bearing 3,4-Ethylene-dioxythiophene-based Thiophenyl Moieties for Organic Field Effect Transistor

  • Kim, Dae-Chul (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Lee, Tae-Wan (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Lee, Jung-Eun (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Kim, Kyung-Hwan (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Cho, Min-Ju (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Choi, Dong-Hoon (Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University) ;
  • Han, Yoon-Deok (Department of Physics, Korea University) ;
  • Cho, Mi-Yeon (Department of Physics, Korea University) ;
  • Joo, Jin-Soo (Department of Physics, Korea University)
  • Published : 2009.07.25
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Abstract

New $\pi$-conjugated multi-branched molecules were synthesized through the Homer-Emmons reaction using alkyl-substituted, 3,4-ethylenedioxythiophene-based, thiophenyl aldehydes and octaethyl benzene-l,2,4,5-tetrayltetrakis(methylene) tetraphosphonate as the core unit; these molecules have all been fully characterized. The two multi-branched conjugated molecules exhibited excellent solubility in common organic solvents and good self-film forming properties. The semiconducting properties of these multi-branched molecules were also evaluated in organic field-effect transistors (OFET). With octyltrichlorosilane (OTS) treatment of the surface of the $SiO_2$ gate insulator, two of the crystalline conjugated molecules, 7 and 8, exhibited carrier mobilities as high as $2.4({\pm}0.5){\times}10^{-3}$ and $1.3({\pm}0.5){\times}10^{-3}cm^2V^{-1}s^{-1}$, respectively. The mobility enhancement of OFET by light irradiation ($\lambda$ = 436 nm) supported the promising photo-controlled switching behavior for the drain current of the device.

Keywords

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