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Role of the Side Chain in the Phase Segregation of Polymer:Fullerene Bulk Heterojunction Composites

Authors

  • Heejoo Kim,

    Corresponding author
    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Byoung Hoon Lee,

    1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Kyu Cheol Lee,

    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Geunjin Kim,

    1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Jin Young Yu,

    1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Nara Kim,

    1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Seoung Ho Lee,

    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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  • Kwanghee Lee

    Corresponding author
    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
    2. School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
    3. Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea
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Abstract

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The correlation between the geometrical structural change in push-pull π-conjugated polymers and the formation of phase segregation in their bulk heterojunction (BHJ) composite films is investigated. When substituted with large alkyl side chains, the polymer wires experience serious conformational distortion by increasing the torsion energy of dihedral angles along the backbone and undergo large-scale phase segregation in the BHJ composites.

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