Poly(3-hexylthiophene) Nanorods with Aligned Chain Orientation for Organic Photovoltaics

Authors

  • Jong Soo Kim,

    1. School of Environmental Science and Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Yunmin Park,

    1. Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Dong Yun Lee,

    1. Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Ji Hwang Lee,

    1. School of Environmental Science and Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Jong Hwan Park,

    1. Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Jin Kon Kim,

    Corresponding author
    1. Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
    • Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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  • Kilwon Cho

    Corresponding author
    1. Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
    • Department of Chemical Engineering Polymer Research Institute Pohang University of Science and Technology Pohang, 790-784 (Korea)
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Abstract

A structured polymer solar cell architecture featuring a large interface between donor and acceptor with connecting paths to the respective electrodes is explored. To this end, poly-(3-hexylthiophene) (P3HT) nanorods oriented perpendicularly to indium tin oxide (ITO) glass are fabricated using an anodic aluminum oxide template. It is found that the P3HT chains in bulk films or nanorods are oriented differently; perpendicular or parallel to the ITO substrate, respectively. Such chain alignment of the P3HT nanorods enhanced the electrical conductivity up to tenfold compared with planar P3HT films. Furthermore, the donor/acceptor contact area could be maximised using P3HT nanorods as donor and C60 as acceptor. In a photovoltaic device employing this structure, remarkable photoluminescence quenching (88%) and a seven-fold efficiency increase (relative to a device with a planar bilayer) are achieved.

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