| Summary: | 碩士 === 國立清華大學 === 化學系 === 97 === Using our method of retro-malonate addition reaction, we have synthesized series of dipolar dyes, IP1~IP4, containing pyrrolo[3,4-b] indole conjugate spacers between arylamine donor and the 2-cyanoacrylic acid acceptor. These exhibited both π-π* and charge-transfer transition in the absorption spectra. The maximum absorption peak of IP1~IP3 located at 446nm~451nm, and IP4 was at 432nm which revealed blue shift. By differential pulse voltammetry measurements, we observed that the lowest unoccupied molecular orbital (LUMO) of these dyes located between -2.4 eV and -2.8 eV and the highest occupied molecular orbital (HOMO) located between -4.9 eV and -5.2 eV. According to the HOMO and LUMO potentials, we believed that these compounds could be used on dye-sensitized solar cells. The results from quantum computation indicated that poor planarity and insufficient conjugation diminished the electron-transfer of these dyes. Dye-sensitized solar cells using these materials as the sensitizers exhibited conversion efficiencies ranging from 1.00% to 1.70%.
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