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Synergistic Effect of Processing Additives and Optical Spacers in Bulk-Heterojunction Solar Cells

Authors

  • Sooncheol Kwon,

    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea
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  • Jin Kuen Park,

    1. Center for Polymer and Organic Solids (CPOS), Departments of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106-5090, USA
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  • Geunjin Kim,

    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea
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  • Jaemin Kong,

    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea
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  • Guillermo C. Bazan,

    Corresponding author
    1. Center for Polymer and Organic Solids (CPOS), Departments of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106-5090, USA
    • Center for Polymer and Organic Solids (CPOS), Departments of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106-5090, USA.
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  • Kwanghee Lee

    Corresponding author
    1. Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea
    • Heeger Center for Advanced Materials (HCAM), Research Institute for Solar and Sustainable Energies (RISE), School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea
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Abstract

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Processing a bulk-heterojunction (BHJ) solar cell with a narrow-bandgap polymer (P1) and a fullerene (PC71BM) results in a smooth surface morphology, and better performance is observed when a 1-chloronaphthalene solvent additive is used. The smooth surface enables the introduction of a titanium suboxide (TiOx) optical spacer between the BHJ layer and the electrode, which increases light absorption by redistributing the light intensity. TiOx incorporation leads to increases in the power conversion efficiency and device lifetime.

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