Controlling Molecular Packing for Charge Transport in Organic Thin Films

Authors

  • Liqiang Li,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100191, P.R. China
    2. Physikalisches Institut and Center for Nanotechnology (CeNTech), Universität Münster, Münster 48149, Germany
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  • Wenping Hu,

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100191, P.R. China
    • Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100191, P.R. China
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  • Harald Fuchs,

    1. Physikalisches Institut and Center for Nanotechnology (CeNTech), Universität Münster, Münster 48149, Germany
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  • Lifeng Chi

    Corresponding author
    1. Physikalisches Institut and Center for Nanotechnology (CeNTech), Universität Münster, Münster 48149, Germany
    • Physikalisches Institut and Center for Nanotechnology (CeNTech), Universität Münster, Münster 48149, Germany
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Abstract

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Tuning of the packing mode, including the film morphology, molecular orientation, and phase state of chloroaluminum phthalocyanine (ClAlPc), is demonstrated, and yields optimal parallel and vertical channels for charge transport. On a pure SiO2 surface, the ClAlPc molecules lie flat and grow in the Volmer–Weber mode, resulting in a cone-array structure that is highly desirable for heterojunction organic solar cells and organic field emission. On an OTS-modified surface, the ClAlPc molecules stand obliquely and Stranski–Krastanov growth of a continuous and flat film occurs, which is suitable for organic transistors.

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