A Comparative Study on Two RuII Complexes with Thiophene-Based Ancillary Ligands for High-Efficiency Dye-Sensitized Solar Cells.

Autor: Su, Rui, Elmorsy, Mohamed R., Abed, Mira, Islam, Ashraful, Lord, Meghan, Fadda, Ahmed A., El‐Shafei, Ahmed
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Zdroj: European Journal of Inorganic Chemistry; 8/25/2017, Vol. 2017 Issue 31, p3690-3697, 8p
Abstrakt: Heteroleptic polypyridyl Ru complexes MMR-1 and MMR-2 containing 2-(methylthio)thienyl and 2-(4-methoxyphenyl) thienyl units on the antennas of ancillary ligands, respectively, were designed, synthesized, and characterized as sensitizers for dye-sensitized solar cells. The maximum absorption wavelength of MMR-1 is more red-shifted than that of MMR-2, but MMR-2 has a higher molar extinction coefficient, leading to better light harvesting. Under the same device-fabrication conditions, the photovoltaic performances of these sensitizers were evaluated while anchored on mesoporous TiO2 and compared to that of the benchmark N719. Both MMR-1 and MMR-2 exhibited comparable or even higher solar-to-electric conversion efficiencies η with respect to N719 when em-ployed as photosensitizers in DSSCs. Compared to MMR-1, MMR-2 exhibited better overall conversion efficiency, which was attributed to the electron-donating effect of the 4-methoxyphenyl group and the better absorptivity by harvesting higher-energy photons. Complex MMR-2 also showed higher open-circuit voltage VOC than MMR-1, which is likely due to the extension of the antenna of the ancillary ligand by inserting a phenyl group, which leads to less dye aggregation. The photovoltaic performance of MMR-2 was better, with a shortcircuit photocurrent density of 16.76 mA cm-2, a VOC of 0.673 V, a fill factor of 73.5 %, and an η value of 8.29 % with the addition of 0.5 M 4-tert-butylpyridine (TBP) compared to 8.18 % for N719. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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