| Summary: | 碩士 === 國立中央大學 === 化學學系 === 102 === New D-A-A type sensitizers (JH dyes), comprised of arylamine as the electron donor, dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c]furazan (DTBF) containing conjugated segment as the conjugated bridge, and 2-cyanoacrylic acid as both the acceptor and anchor, have been synthesized. Kumada coupling, Hartwig-Buchwald coupling, Stille coupling, Vilsmeier-Haack reaction and Knoevenagel condensation reactions are used for the dyes synthese.
The physical properties of the new dyes were characterized by photophysical and electrochemical measurements, and theoretical computation. Dye-sensitized solar cells were also fabricated using new developed dyes as the sensitizers. The charge transfer character in the compounds is beneficial to the electron injection into TiO2 after photoexcitation. With good absorption in the spectral range from 350 to 500 nm, due to the presence of a large and flat DTBF entity in the spacer, the bulky alkyl chains in the dye molecule can not effectively suppress dye aggregation. Therefore, CDCA was added as the co-adsorbent to suppression dye aggregation. Addition of CDCA indeed improves the cell performance. DSSC of JH-5 has best efficiency of 7.34%, reaching 97% of the standard cell N719.
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