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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3359
Title: Pyrene-based organic dyes with thiophene containing Ï€-linkers for dye-sensitized solar cells: Optical, electrochemical and theoretical investigations
Authors: Baheti A.
Lee C.-P.
Thomas K.R.J.
Ho K.-C.
Published in: Physical Chemistry Chemical Physics
Abstract: A new series of metal-free organic dyes containing pyrene and α-cyanoacrylic acid end groups and thiophene, bithiophene, thienylbenzene or thienylfluorene Ï€-linkers were synthesized and characterized by absorption, emission and electrochemical measurements. Time-dependent density functional theoretical calculations were also performed to unravel the nature of the absorption induced electronic excitations. Extension of conjugation in the Ï€-linker by the incorporation of phenyl or fluorene was found to enhance the molar extinction coefficient while the use of thiophene red-shifted the absorption. The longer wavelength absorption peaks found for the dyes were attributed to Ï€-Ï€* transition with a contribution from the charge transfer transition which becomes prominent for the bithiophene bridged derivative. The bithiophene containing dye showed moderate overall light-to-electron conversion efficiency attributable to the favorable absorption and redox properties originating due to the presence of a bithiophene segment. The trends observed for the various dyes in the device performance were rationalized by electron-impedance spectroscopy measurements. © 2011 the Owner Societies.
Citation: Physical Chemistry Chemical Physics (2011), 13(38): 17210-17221
URI: https://doi.org/10.1039/c1cp21714c
http://repository.iitr.ac.in/handle/123456789/3359
Issue Date: 2011
ISSN: 14639076
Author Scopus IDs: 26638669500
55050004100
57203389297
56962715200
Author Affiliations: Baheti, A., Organic Materials Lab, 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
Thomas, K.R.J., Organic Materials Lab, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee - 247 667, India
Ho, K.-C., Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
Corresponding Author: Thomas, K.R.J.; Organic Materials Lab, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee - 247 667, India; email: krjt8fcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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