An efficient light-harvesting ruthenium dye for solar cell application |
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| Authors: | Shi-Jhang Wu Chia-Yuan Chen Jian-Ging Chen Jheng-Ying Li Yung-Liang Tung Kuo-Chuan Ho Chun-Guey Wu |
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| Affiliation: | aDepartment of Chemistry, National Central University, Jhong-Li 32001, Taiwan, ROC;bDepartment of Chemical Engineering, National Taiwan University, Taipei, 10617 Taiwan, ROC;cPhotovoltaics Technology Center, Industrial Technology Research Institute (ITRI), Hsin-Chu, 310 Taiwan, ROC |
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| Abstract: | A novel, heteroleptic ruthenium dye comprising a vinyl group between the carboxylate and bipyridine segments as well as extended π-conjugation of the ancillary ligand, employing alkyl-bithiophene, was synthesized. The dye displayed a remarkably high absorption coefficient of 2.51 × 104 M−1 cm−1 (at 562 nm) for its metal-to-ligand charge transfer band. The photo-to-current conversion efficiency of the corresponding dye-sensitized solar cell was 9.12% under AM 1.5 (100 mW/cm2) irradiation. Furthermore, owing to both the very strong metal-to-ligand charge transfer band and the large number of dye molecules adsorbed on the TiO2 electrode, the conversion efficiency of the dye-sensitized cell was >7.5% at a light intensity ≤198 mW cm−2. |
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| Keywords: | Ruthenium Heteroleptic Dye-sensitized solar cell Thiophene Conjugation High-efficiency |
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