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Please use this identifier to cite or link to this item: 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 Ï€-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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