標題: Tuning Spectral and Electrochemical Properties of Porphyrin-Sensitized Solar Cells
作者: Lo, Chen-Fu
Hsu, Shun-Ju
Wang, Chin-Li
Cheng, Yi-Hui
Lu, Hsueh-Pei
Diau, Eric Wei-Guang
Lin, Ching-Yao
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
公開日期: 15-七月-2010
摘要: Phenylethynyl-substituted porphyrin (PEI) 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 Me(2)N-PE1 > MeO-PE1 > CN-PE1 > NO(2)-PE1, for which Me(2)N-PE1 has a device performance about 90% of that of a N719-sensitized solar cell under the same experimental conditions. The superior performance of Me(2)N-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 TiO(2) for Me(2)N-PE1 and MeO-PE1 upon excitation, but that driving force reverses for NO(2)-PE1. Electrochemical tests indicate that both LUMO and HOMO levels show a systematic trend Me(2)N-PE1 > MeO-PE1 > CN-PE1 > NO(2)-PE1, consistent with the trend of variation of the short-circuit currents in this series of sensitizers.
URI: http://dx.doi.org/10.1021/jp103561c
http://hdl.handle.net/11536/5139
ISSN: 1932-7447
DOI: 10.1021/jp103561c
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 114
Issue: 27
起始頁: 12018
結束頁: 12023
顯示於類別:期刊論文


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