https://scholars.lib.ntu.edu.tw/handle/123456789/408652
標題: | Bi-anchoring Organic Dyes that Contain Benzimidazole Branches for Dye-Sensitized Solar Cells: Effects of £k Spacer and Peripheral Donor Groups | 作者: | Bodedla G.B. Thomas K.R.J. Fan M.-S. Ho K.-C. |
關鍵字: | benzimidazoles;dyes/pigments;heterocycles;solar cells;structure¡Vactivity relationships | 公開日期: | 2016 | 卷: | 11 | 期: | 18 | 起(迄)頁: | 2564-2577 | 來源出版物: | Chemistry - An Asian Journal | 摘要: | Benzimidazole-branched bi-anchoring organic dyes that contained triphenylamine/phenothiazine donors, 2-cyanoacrylic acid acceptors, and various £k linkers were synthesized and examined as sensitizers for dye-sensitized solar cells. The structure¡Vactivity relationships in these dyes were systematically investigated by using absorption spectroscopy, cyclic voltammetry, and density functional theory calculations. The wavelength of the absorption peak was more-heavily influenced by the nature of the £k linker than by the nature of the donor. For a given donor, the absorption maximum (£f max ) was red-shifted on changing the £k linker from phenyl to 2,2¡¬-bithiophene, whilst the dyes that contained triphenylamine units displayed higher molar extinction coefficients (?) than their analogous phenothiazine-based triphenylamine dyes, which led to good light-harvesting properties in the triphenylamine-based dyes. Electrochemical data for the dyes indicated that the triphenylamine-based dyes possessed relatively low-lying HOMOs, which could be beneficial for suppressing back electron transfer from the conduction band of TiO 2 to the oxidized dyes, owing to facile regeneration of the oxidized dye by the electrolyte. The best performance in the DSSCs was observed for a dye that possessed a triphenylamine donor and 2,2¡¬-bithiophene £k linkers. Electron impedance spectroscopy (EIS) studies revealed that the use of triphenylamine as the donor and phenyl or 2,2¡¬-bithiophene as the £k linkers was beneficial for disrupting the dark current and charge-recombination kinetics, which led to a long electron lifetime of the injected electrons in the conduction band of TiO 2 . ? 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408652 | ISSN: | 18614728 | DOI: | 10.1002/asia.201600766 |
顯示於: | 化學工程學系 |
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