https://scholars.lib.ntu.edu.tw/handle/123456789/391287
標題: | Effect of auxiliary chromophores on the optical, electrochemical, and photovoltaic properties of carbazole-based dyes | 作者: | Venkateswararao, A. Justin Thomas, K.R. Lee, C.-P. Ho, K.-C. KUO-CHUAN HO |
關鍵字: | Carbazoles; Chromophores; Dye-sensitized solar cells; Electrochemical impedance spectroscopy; Organic dyes | 公開日期: | 2015 | 卷: | 4 | 期: | 1 | 起(迄)頁: | 69-80 | 來源出版物: | Asian Journal of Organic Chemistry | 摘要: | Organic dyes containing 2-diphenylaminocarbazole donors and decorated with auxiliary chromophores at the diphenylamine moiety have been synthesized and characterized. The nature of the chromophores on diphenylamine unit alters the light-harvesting properties and HOMO/LUMO energies of the dyes. Butoxy substitution raises the HOMO and lowers the LUMO energies. But the incorporation of fluorenyl units fine-tunes the LUMO upwardly, which improves the thermodynamic driving force for electron injection into the conduction band of TiO2 and hikes the incident photon-to-current conversion efficiency. Consequently, a dye with fluorene in the donor unit and thiophene in the π-conjugation pathway is the most efficient (5.76%) and has the highest photocurrent density (14.60mAcm-2) in the series. Electrochemical impedance analysis of the devices showed the importance of fluorene units in suppressing electron recombination. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84920436193&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/391287 |
DOI: | 10.1002/ajoc.201402235 |
顯示於: | 化學工程學系 |
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