New semiconducting multi-branched conjugated molecules bearing 3,4-ethylene- dioxythiophene-based thiophenyl moieties for organic field effect transistor

Dae Chulr Kim, Tae Wanr Lee, Jung Eunr Lee, Kyung Hwanr Kim, Min Jur Cho, Dong Hoonr Choi, Yoon Deokr Han, Mi Yeonr Cho, Jin Soor Joo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

New φ-conjugated multi-branched molecules were synthesized through the Homer-Emmons reaction using alkyl-substituted, 3,4-ethylenedioxythiophene-based, thiophenyl aldehydes and octaethyl benzene-1,2,4,5- 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 Si02 gate insulator, two of the crystalline conjugated molecules, 7 and 8, exhibited carrier mobilities as high as 2.4 (± 0.5)*10-3 and 1.3 (± 0.5)xl0 -3 cm2 V-1s-1, respectively. The mobility enhancement of OFET by light irradiation (γ = 436 ran) supported the promising photo-controlled switching behavior for the drain current of the device.

Original languageEnglish
Pages (from-to)491-498
Number of pages8
JournalMacromolecular Research
Volume17
Issue number7
DOIs
Publication statusPublished - 2009 Jul

Keywords

  • Conjugated semiconductor
  • Mobility
  • Multi-branched molecule
  • Organic field effect transistor
  • Organic pho-totransistor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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