Abstract
We have achieved 8% efficiency for the ruthenium(ii) dye, SY-04, in quasi-solid state dye sensitized solar cells using a supramolecular oligomer-based electrolyte. The dyes in this study, SY-04 and SY-05, which were synthesized through highly efficient synthetic routes, showed better molar extinction coefficients compared to that of the Z907 dye. In the absorption spectra, SY-04 and SY-05 displayed better red shifted metal ligand charge transfer (MLCT) absorption bands at 533, 382 and 535, 373 nm, respectively, compared with 521, 371 nm of the Z907 dye. Also, SY-04 and SY-05 showed better molar extinction coefficients, 6691, 16189 M-1 cm-1 and 6694, 16195 M-1 cm-1 as compared with the Z907 dye, 4308, 4917 M-1 cm-1. When excited into the charge-transfer absorption bands of SY-04 and SY-05 in ethanol at 77 K, broad emission bands for SY-04 and SY-05 with a maximum at 788 nm and 786 nm, respectively, were observed compared to the emission band of Z907 at 797 nm. The current-voltage characteristics of the SY-04 sensitizer gave the best performance data, J SC = 18.0 mA cm-2, VOC = 0.662 V, ff = 0.663, and an η of 8.0%. The increased VOC value for SY-04 than Z907 is mainly attributed to high charge recombination resistance by effective dye coverage, which is confirmed by impedance spectroscopy. This journal is
Original language | English |
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Pages (from-to) | 13338-13344 |
Number of pages | 7 |
Journal | Journal of Materials Chemistry A |
Volume | 2 |
Issue number | 33 |
DOIs | |
Publication status | Published - 7 Sept 2014 |
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science