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Shape- and Functionality-Controlled Organization of TiO2–Porphyrin–C60 Assemblies for Improved Performance of Photochemical Solar Cells

Authors

  • Taku Hasobe Dr.,

    1. Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, SORST, Japan Science and Technology Agency, Osaka 565-0871, Japan, Fax: (+81) 6-6879-7370
    2. Radiation Laboratory, Departments of Chemistry & Biochemistry and Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA, Fax: (+1) 574-631-8068
    3. Current address: School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), Nomi, Ishikawa, 923-1292, Japan
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  • Shunichi Fukuzumi Prof.,

    1. Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, SORST, Japan Science and Technology Agency, Osaka 565-0871, Japan, Fax: (+81) 6-6879-7370
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  • Shigeki Hattori,

    1. Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, SORST, Japan Science and Technology Agency, Osaka 565-0871, Japan, Fax: (+81) 6-6879-7370
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  • Prashant V. Kamat Prof.

    1. Radiation Laboratory, Departments of Chemistry & Biochemistry and Chemical & Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA, Fax: (+1) 574-631-8068
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Abstract

Shape- and functionality-controlled organization of porphyrin derivatives–C60 supramolecular assemblies using TiO2 nanotubes and nanoparticles has been achieved for the development of photochemical solar cells. The differences in the efficiency of light-energy conversion of these solar cells are explained on the basis of the geometrical orientation of the porphyrins with respect to the TiO2 surface and the supramolecular complex formed with C60. The maximum photon-conversion efficiency (IPCE) of 60 % obtained with TiO2 nanotube architecture is higher than the value obtained with nanoparticle architecture. The results presented in this study show the importance of substrate morphology in promoting electron transport within the mesoscopic semiconductor film.

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