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Honeycomb-Like Organized TiO2 Photoanodes with Dual Pores for Solid-State Dye-Sensitized Solar Cells

Authors

  • Sung Hoon Ahn,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea
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  • Won Seok Chi,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea
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  • Dong Jun Kim,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea
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  • Sung Yeon Heo,

    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea
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  • Jong Hak Kim

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea
    • Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno Seodaemun-gu, Seoul 120-749, South Korea.
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Abstract

A solid-state dye-sensitized solar cell (ssDSSC) with 7.4% efficiency at 100 mW/cm2 is reported. This efficiency is one of the highest observed for N719 dye. High performance is achieved via a honeycomb-like, organized mesoporous TiO2 photoanode with dual pores, high porosity, good interconnectivity, and excellent light scattering properties. The TiO2 photoanodes are prepared without any TiCl4 treatment via a one-step, direct self-assembly of hydrophilically preformed TiO2 nanocrystals and poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer as a titania source and a structure-directing agent, respectively. Upon controlling the secondary forces between the polymer/TiO2 hybrid and the solvent by varying the amounts of HCl/H2O mixture or toluene, honeycomb-like structures are generated to improve light scattering properties. Such multifunctional nanostructures with dual pores provide good pore-filling of solid polymer electrolyte with large volume, enhanced light harvesting and reduced charge recombination, as confirmed by reflectance spectroscopy, incident photon-to-electron conversion efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) analysis.

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