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

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Abstract

New Π-conjugated multi-branched molecules were synthesized through the Horner-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 selffilm 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 SiO2 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)×10−3 cm2V−1s−1, respectively. The mobility enhancement of OFET by light irradiation (λ = 436 nm) supported the promising photo-controlled switching behavior for the drain current of the device.

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Authors and Affiliations

  1. Department of Chemistry, Advanced Materials Chemistry Research Center, Korea University, 136-701, Seoul, Korea

    Dae Chul Kim, Tae Wan Lee, Jung Eun Lee, Kyung Hwan Kim, Min Ju Cho & Dong Hoon Choi

  2. Department of Physics, Korea University, 136-701, Seoul, Korea

    Yoon Deok Han, Mi Yeon Cho & **-soo Joo

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  1. Dae Chul Kim
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  2. Tae Wan Lee
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  3. Jung Eun Lee
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  4. Kyung Hwan Kim
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  5. Min Ju Cho
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  6. Dong Hoon Choi
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  7. Yoon Deok Han
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  8. Mi Yeon Cho
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  9. **-soo Joo
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Correspondence to Dong Hoon Choi.

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Kim, D.C., Lee, T.W., Lee, J.E. et al. New semiconducting multi-branched conjugated molecules bearing 3,4-ethylenedioxythiophene-based thiophenyl moieties for organic field effect transistor. Macromol. Res. 17, 491–498 (2009). https://doi.org/10.1007/BF03218897

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  • DOI: https://doi.org/10.1007/BF03218897

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