| Summary: | 碩士 === 國立中央大學 === 化學學系 === 106 === In this research, we designed and synthesized two new ruthenium complexes, coded CYC-37 and CYC-39, respectively for the application in dye-sensitized solar cells (DSCs). The concept of molecular engineering is originated from the Black dye (N749). We replaced one carboxyl group at the fourth position of terpyridine ligand with a conjugated moiety to expand the light absorption range and to enhance the molar absorption coefficient. A hexyl substituent was attached at the terminal of the anchoring ligands to improve adsorption stability of dye molecules. With the attempts to investigate the electron donating and withdrawing effects on the properties of dye molecules and the device performance, the conjugated heterocycle used in CYC-37 and CYC-39 is 3,4-ethylene-dioxythiophene (EDOT) and thiazole, respectively. The maximum absorption wavelength (λmax) of CYC-37 and CYC-39 in DMF is 615 nm and 616 nm, respectively. Compared to the Black dye, CYC-37 and CYC-39 both show superior light harvesting capability. The preliminary test shows that the device sensitized with CYC-39 in conjunction with an iodide-based electrolyte has the good efficiency of 9.0%, which surpasses that of Black dye (8.8%) measured under the same conditions. These results exhibit that the terpyridine ligand bearing unprecedentedly the electron withdrawing heterocycle, thiazole, at the fourth binding position is promising to boost the power conversion efficiency of ruthenium complex sensitized solar cells.
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