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 |