| 摘要: | 摘要： Two heteroleptic ruthenium complexes, SJW-B18 and CYC-B11H , with four alkyl groups and two alkyl groups, respectively, on the terminal of their ancillary ligand were prepared. These two complexes have a similar absorption profile, energy level and orbital distribution of the frontier orbitals. Therefore, they are good model compounds to explore the effect of the molecular structure of a ruthenium sensitizer on their photovoltaic performance, especially when cobalt electrolyte was used in assembling the device. When I − /I 3 − electrolyte was employed, the dye-sensitized solar cell based on SJW-B18 and CYC-B11H sensitizers achieved similar power conversion efficiencies of 9.54% and 9.64%, respectively, because the two dyes have similar optical and electronic properties. Nevertheless, when Co (II)/(III) electrolyte was used, the SJW-B18 sensitized device has a higher efficiency (7.30%) than the CYC-B11H -based cell (6.65%), mainly in higher open-circuit voltage (0.829 V vs. 0.784 V). Electrochemical impedance and intensity modulated photocurrent/photovoltage spectroscopic data reveal that the SJW-B18 dyed titanium dioxide (TiO 2 ) anode has better surface protection compared to the CYC-B11H adsorbed TiO 2 film. The physical insulation of the TiO 2 surface with the four alkyl groups on the SJW-B18 dye can reduce the charge recombination between the electron on TiO 2 and Co (III) to increase the open circuit voltage, and the power conversion efficiency of the device. These results provide a new strategy for designing ruthenium sensitizers which are compatible with a cobalt-based electrolyte.
出版日期： 2014-11-07
出處： Journal of materials chemistry. A, Materials for energy and sustainability, 2014-11, Vol.2 (41), p.17551-17560
資源來源： Royal Society of Chemistry
識別號： ISSN: 2050-7488
識別號： ISSN: 2050-7496
識別號： EISSN: 2050-7496
識別號： DOI: 10.1039/C4TA01750A |
