標題: | Design and Characterization of Heteroleptic Ruthenium Complexes Containing Benzimidazole Ligands for Dye-Sensitized Solar Cells: The Effect of Thiophene and Alkyl Substituents on Photovoltaic Performance |
作者: | Huang, Wei-Kai Wu, Hui-Ping Lin, Pi-Lun Diau, Eric Wei-Guang 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: | 7-Feb-2013 |
摘要: | We designed heteroleptic ruthenium complexes RD16-RD18 containing fluoro-substituted and thiophene-based benzimidazole ligands for dye-sensitized solar cells. Whereas the substitution of only fluorine in the RD12 device has an effect of enhancing the open-circuit voltage (V-OC), additional substitution of thiophene in the RD16-RD18 sensitizers showed a slightly decreased V-OC. Systematic enhanced short-circuit current density (J(SC)) and efficiency (eta) of power conversion of the devices had the order RD18 > RD17 > RD16 > RD12 > N719, attributed to the increasing light-harvesting ability and the broadened spectral features with thiophene-based ligands. Measurements of charge extraction and intensity-modulated photovoltage spectra indicate that thiophene substitution shifts downward the TiO2 potential and accelerates charge recombination, but inclusion of a long hexyl chain on the thiophene moiety retards charge recombination to account for the variation of V-OC in the series. For a duration test of device performance at ambient temperature, only similar to 2% degradation of cell performance was found for the devices of RD18 and RD12 over 2000 h, but a 10% decrease in overall efficiency was observed in the N719 device. |
URI: | http://dx.doi.org/10.1021/jp3118693 http://hdl.handle.net/11536/21223 |
ISSN: | 1932-7447 |
DOI: | 10.1021/jp3118693 |
期刊: | JOURNAL OF PHYSICAL CHEMISTRY C |
Volume: | 117 |
Issue: | 5 |
起始頁: | 2059 |
結束頁: | 2065 |
Appears in Collections: | Articles |
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