| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 99 === The development of renewable energy becomes one of the most important issue in this centry. Dye-sensitized solar cell (DSSC), one of the 3rd generation photovoltaics, has caused lots of attention due to its colorful, flexible, transparent and low cost. In this thesis, we design and synthesis of two Ru-based sensitizers: CYC-B12 and CYC-B23 for DSSC. The ancillary ligand of CYC-B12 use thieno[3,2-b]thiophene to extend the conjugation length and DTBC, the carbazole derivative as a electron donor moiety was added in the terminal. For CYC-B12, we discuss the effects of the electrolyte on the performance of the devices. We also used Transient photoelectrical decay experiments to probe the reason for the decay in performance after aging process. DSSC device using CYC-B12 and the liquid electrolyte, Z960 has the overall power conversion efficiency of 9.4 %. CYC-B23 uses unsymmetrical anchoring ligand Ligand-B23 and ancillary ligand Ligand-B20. We have proved that good power conversion efficiency can be achieved by using ruthenium complex with only one carboxylic acid. With a preliminary testing, the device sensitized by CYC-B23 has a short-circuit photocurrent density of 16.1 mA/cm2, an open-circuit photovoltage of 0.754 V, and a fill factor of 0.65, yielding an overall conversion efficiency (η) of 7.91 %. NMR is employed to identify the structure of Ligand-B12 and Ligand-B23 and the corresponding complexes. Localizations of HOMOs and LUMOs in these sensitizers were calculated using TDDFT、Semi-empirical ZINDO/1. The relationships between the frontier orbitals and the light harvesting capacity of these Ru complexes was discussed.
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