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Hybrid Templated Synthesis of Crack-Free, Organized Mesoporous TiO2 Electrodes for High Efficiency Solid-State Dye-Sensitized Solar Cells

Authors

  • Jung Tae Park,

    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 Kyu Roh,

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

Organic/inorganic hybrid templates, i.e., aluminium oxide (Al2O3) nanoparticles grafted with poly(oxyethylene) methacrylate, Al2O3-POEM, are synthesized via surface-initiated atom transfer radical polymerization (ATRP), as confirmed by Fourier transform-infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Upon combining the Al2O3-POEM with titanium(IV) isopropoxide (TTIP), hydrophilic TTIP is selectively confined in the hydrophilic POEM chains through hydrogen bonding interactions. Following the calcination at 450 °C and the selective etching of Al2O3 with NaOH, the OM-TiO2 films with high surface areas, good interconnectivity, and anatase phase are obtained. The solid-state dye-sensitized solar cells (ssDSSCs) fabricated with OM-TiO2 photoelectrodes and a polymerized ionic liquid (PIL) show a high energy conversion efficiency of 7.3% at 100 mW cm−2, which is one of the highest values for ssDSSCs. The high cell performance is due to the well-organized structure, resulting in improved dye loading, excellent pore filling of electrolyte, enhanced light harvesting, and reduced charge recombination.

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