Quinoxaline-Fused Porphyrins for Dye-Sensitized Solar Cells
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- 作者：Seunghun Eu ; Shinya Hayashi ; Tomokazu Umeyama ; Yoshihiro Matano ; Yasuyuki Araki ; Hiroshi Imahori
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：March 20, 2008
- 年：2008
- 卷：112
- 期：11
- 页码：4396 - 4405
- 全文大小：320K
- 年卷期：v.112,no.11(March 20, 2008)
- ISSN：1932-7455
文摘
5,10,15,20-Tetrakis(2,4,6-trimethylphenyl)-6'-carboxyquinoxalino[2,3-
]porphyrinatozinc (II) (ZnQMA) and5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-6',7'-dicarboxyquinoxalino[2,3-]porphyrinatozinc (II) (ZnQDA)have been synthesized to evaluate the effects of ,'-carboxyquinoxalino moieties on the structure and optical,electrochemical, and photovoltaic properties of the porphyrins. Both ZnQMA and ZnQDA exhibited broadenedand red-shifted light absorption in UV-visible absorption spectra compared with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphyrinatozinc (II) (ZnP). ZnQMA and ZnQDA also showed decrease in the highest occupiedmolecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap due to the extension of theporphyrin 
-system. From the results of 1H NMR spectroscopy and DFT calculations, ZnQMA and ZnQDAwere found to adopt saddle and planar structures, respectively. ZnQMA-sensitized TiO2 solar cell with TiO2nanoparticles (P25) revealed the power conversion efficiency (
) of 5.2%, whereas ZnQDA-sensitized cellshowed = 4.0%. The superior performance of the ZnQMA-sensitized solar cell to the ZnQDA-sensitizedone is originated from both the more favorable electron injection and charge collection efficiency.
]porphyrinatozinc (II) (ZnQMA) and5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-6',7'-dicarboxyquinoxalino[2,3-]porphyrinatozinc (II) (ZnQDA)have been synthesized to evaluate the effects of ,'-carboxyquinoxalino moieties on the structure and optical,electrochemical, and photovoltaic properties of the porphyrins. Both ZnQMA and ZnQDA exhibited broadenedand red-shifted light absorption in UV-visible absorption spectra compared with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphyrinatozinc (II) (ZnP). ZnQMA and ZnQDA also showed decrease in the highest occupiedmolecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap due to the extension of theporphyrin -system. From the results of 1H NMR spectroscopy and DFT calculations, ZnQMA and ZnQDAwere found to adopt saddle and planar structures, respectively. ZnQMA-sensitized TiO2 solar cell with TiO2nanoparticles (P25) revealed the power conversion efficiency () of 5.2%, whereas ZnQDA-sensitized cellshowed = 4.0%. The superior performance of the ZnQMA-sensitized solar cell to the ZnQDA-sensitizedone is originated from both the more favorable electron injection and charge collection efficiency.