http://repository.iitr.ac.in/handle/123456789/3314
Title: | Effect of auxiliary chromophores on the optical, electrochemical, and photovoltaic properties of carbazole-based dyes |
Authors: | Venkateswararao A. Justin Thomas, K. R. Lee C.-P. Ho K.-C. |
Published in: | Asian Journal of Organic Chemistry |
Abstract: | 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. |
Citation: | Asian Journal of Organic Chemistry (2015), 4(1): 69-80 |
URI: | https://doi.org/10.1002/ajoc.201402235 http://repository.iitr.ac.in/handle/123456789/3314 |
Issue Date: | 2015 |
Publisher: | Wiley-VCH Verlag |
Keywords: | Carbazoles Chromophores Dye-sensitized solar cells Electrochemical impedance spectroscopy Organic dyes |
ISSN: | 21935807 |
Author Scopus IDs: | 37051266500 57203389297 55050004100 56962715200 |
Author Affiliations: | Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India Justin Thomas, K.R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India Lee, C.-P., Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan Ho, K.-C., Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan |
Corresponding Author: | Justin Thomas, K.R.; Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology RoorkeeIndia |
Appears in Collections: | Journal Publications [CY] |
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