(Dibenzoylmethanato)boron Difluoride Derivatives Containing Triphenylamine Moieties: A New Type of Electron‐Donor/π‐Acceptor System for Dye‐Sensitized Solar Cells |
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| Authors: | Yosuke Mizuno Yilihamu Yisilamu Tomoya Yamaguchi Dr. Masaaki Tomura Dr. Takashi Funaki Dr. Hideki Sugihara Prof. Dr. Katsuhiko Ono |
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| Affiliation: | 1. Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa‐ku, Nagoya 466‐8555 (Japan), Fax: (+81)?52‐735‐5407;2. Institute for Molecular Science, Myodaiji, Okazaki 444‐8585 (Japan);3. National Institute of Advanced Industrial Science and Technology, Higashi, Tsukuba 305‐8565 (Japan) |
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| Abstract: | (Dibenzoylmethanato)boron difluoride derivatives containing triphenylamine moieties were synthesized as a new type of electron‐donor/π‐acceptor system. These new compounds exhibited long‐wavelength absorptions in the UV/Vis spectra, and reversible oxidation and reduction waves in cyclic voltammetry experiments. Their amphoteric redox properties are based on their resonance hybrid forms, in which a positive charge is delocalized on the triphenylamine moieties and a negative charge is localized on the boron atoms. Molecular orbital (MO) calculations indicate that their HOMO and LUMO energies vary with the number of phenylene rings connected to the difluoroboron‐chelating ring. This is useful for optimizing the HOMO and LUMO levels to an iodine redox (I?/I3?) potential and a titanium dioxide conduction band, respectively. Dye‐sensitized solar cells fabricated by using these compounds as dye sensitizers exhibited solar‐to‐electric power conversion efficiencies of 2.7–4.4 % under AM 1.5 solar light. |
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| Keywords: | boron donor– acceptor systems electron transfer energy conversion sensitizers |
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