Efficient sensitization of nanocrystalline TiO₂ films with cyanine and merocyanine organic dyes

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• 作者：Sayama ; Kazuhiro ; Tsukagoshi ; Shingo ; Mori ; Tohru ; Hara ; Kohjiro ; Ohga ; Yasuyo ; Shinpou ; Akira ; et. al.
• 关键词：Cyanine dye ; Dye-sensitized solar cell ; Multi-dye system ; Aggregate ; Cholic acid
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2003
• 出版时间：October 15, 2003
• 年：2003
• 卷：80
• 期：1
• 页码：47-71
• 全文大小：537 K

文摘

Various kinds of cyanine and merocyanine organic dyes having short anchoring groups as sensitizers on nanocrystalline TiO₂ electrodes were investigated to promote the short-circuit photocurrent (J_sc) and the solar light-to-power conversion efficiency (η_sun). The J_sc and η_sun improved when the three different three dyes (yellow and red cyanine dyes, and blue squarylium cyanine dye) were adsorbed simultaneously on a TiO₂ electrode, as compared with the J_sc and η_sun of the TiO₂ electrodes adsorbed by each single dye. The maximum η_sun was 3.1 % (AM-1.5, 100mW/cm²). The J_sc and η_sun were influenced by the solvents for the dye adsorption on the TiO₂ electrode, and the efficiencies were improved by the addition of some cholic acids into the dye solution for adsorption. The electron transfer and/or the energy transfer from the red cyanine dye to the blue cyanine dye was observed on a SiO₂ film using emission spectroscopy, suggesting a strong interaction between two dyes. The J-like aggregates of the blue cyanine dyes hardly showed sensitization efficiency.