Molecular Ordering of High-Performance Soluble Molecular Semiconductors and Re-evaluation of Their Field-Effect Transistor Characteristics

Authors

  • Takafumi Izawa,

    1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
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  • Eigo Miyazaki,

    1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
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  • Kazuo Takimiya

    Corresponding author
    1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
    • Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan).
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  • This work was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and an Industrial Technology Research Grant Program from the New Energy and Industrial Technology Development Organization (NEDO), Japan, 2006. We also thank Rigaku Corp. for the in-plane XRD measurements and Nippon Kayaku Co., Ltd. for research cooperation. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

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Intermolecular hydrophobic interactions between long alkyl chains (fastener effect) can enhance the intermolecular overlap of the semiconducting layer of 2,7-dialkyl[1]benzothieno[3,2-b][1]benzothiophenes (Cn-BTBTs; n = 8, 10, 12), which contributes to improvements of the electric characteristics of their organic field-effect transistors. The molecular ordering of Cn-BTBTs in the thin-film state is elucidated by means of in-plane and out-of-plane X-ray diffraction of spin-coated thin films, and single crystal X-ray analysis.

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