Tuning Spectral and Electrochemical Properties of Porphyrin-Sensitized Solar Cells

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• 作者：Chen-Fu Lo ; Shun-Ju Hsu ; Chin-Li Wang ; Yi-Hui Cheng ; Hsueh-Pei Lu ; Eric Wei-Guang Diau ; Ching-Yao Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：July 15, 2010
• 年：2010
• 卷：114
• 期：27
• 页码：12018-12023
• 全文大小：326K
• 年卷期：v.114,no.27(July 15, 2010)
• ISSN：1932-7455

文摘

Phenylethynyl-substituted porphyrin (PE1) sensitizers bearing a nitro, cyano, methoxy, or dimethylamino phenylethynyl substituent were prepared to examine the electron-donating or -withdrawing effects of dyes on the photovoltaic performance of the corresponding dye-sensitized solar cells. The overall efficiencies of power conversion of the devices show a systematic trend Me₂N-PE1 > MeO-PE1 > CN-PE1 > NO₂-PE1, for which Me₂N-PE1 has a device performance about 90% of that of a N719-sensitized solar cell under the same experimental conditions. The superior performance of Me₂N-PE1 is attributed to the effective electron-donating property of the dye that exhibits broadened and red-shifted spectral features. According to frontier orbitals based on DFT calculations, the electrons are effectively injected from the dye to TiO₂ for Me₂N-PE1 and MeO-PE1 upon excitation, but that driving force reverses for NO₂-PE1. Electrochemical tests indicate that both LUMO and HOMO levels show a systematic trend Me₂N-PE1 > MeO-PE1 > CN-PE1 > NO₂-PE1, consistent with the trend of variation of the short-circuit currents in this series of sensitizers.