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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3302
Title: Bi-anchoring Organic Dyes that Contain Benzimidazole Branches for Dye-Sensitized Solar Cells: Effects of Ï€ Spacer and Peripheral Donor Groups
Authors: Bodedla G.B.
Thomas K.R.J.
Fan M.-S.
Ho K.-C.
Published in: Chemistry - An Asian Journal
Abstract: Benzimidazole-branched bi-anchoring organic dyes that contained triphenylamine/phenothiazine donors, 2-cyanoacrylic acid acceptors, and various Ï€ linkers were synthesized and examined as sensitizers for dye-sensitized solar cells. The structure–activity 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 Ï€ linker than by the nature of the donor. For a given donor, the absorption maximum (λmax) was red-shifted on changing the Ï€ linker from phenyl to 2,2′-bithiophene, whilst the dyes that contained triphenylamine units displayed higher molar extinction coefficients (ϵ) 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 TiO2 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 Ï€ linkers. Electron impedance spectroscopy (EIS) studies revealed that the use of triphenylamine as the donor and phenyl or 2,2′-bithiophene as the Ï€ 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 TiO2. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation: Chemistry - An Asian Journal (2016), 11(18): 2564-2577
URI: https://doi.org/10.1002/asia.201600766
http://repository.iitr.ac.in/handle/123456789/3302
Issue Date: 2016
Publisher: John Wiley and Sons Ltd
Keywords: benzimidazoles
dyes/pigments
heterocycles
solar cells
structure–activity relationships
ISSN: 18614728
Author Scopus IDs: 56401178900
57203389297
55179088600
56962715200
Author Affiliations: Bodedla, G.B., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Thomas, K.R.J., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Fan, M.-S., Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan
Ho, K.-C., Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan
Funding Details: K.R.J.T. thanks the DST, New Delhi (DST/TSG/PT/2013/09), for financial support. G.B.B. acknowledges a Senior Research Fellowship (SRF) from the CSIR, New Delhi. We thank the DST for the purchase of a mass spectrometer (ESI) as part of the FIST grant to the Chemistry Department, IIT Roorkee.
Corresponding Author: Thomas, K.R.J.; Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email: krjt8fcy@iitr.ac.in
Appears in Collections:Journal Publications [CY]

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