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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3351
Title: Organic dyes containing pyrenylamine-based cascade donor systems with different aromatic Ï€ linkers for dye-sensitized solar cells: Optical, electrochemical, and device characteristics
Authors: Thomas K.R.J.
Kapoor N.
Lee C.-P.
Ho K.-C.
Published in: Chemistry - An Asian Journal
Abstract: New organic dyes containing pyrenylamine donors in a cascade arrangement and cyanoacrylic acid acceptors have been synthesized and characterized by optical, electrochemical, and theoretical studies. The dyes inherit a D-Ï€ 1-D-Ï€ 2-A (D=donor, A=acceptor) molecular architecture where the Ï€ linkers Ï€ 1 are changed from phenyl to biphenyl and fluorene, whereas the Ï€ linker Ï€ 2 that connects the donor fragment with the acceptor is a phenyl unit. The conjugation pathway linking the two donor segments has been found to play a major role in the optical and electrochemical properties. Shorter Ï€ linkers such as phenyl groups facilitate the donor-acceptor interaction while the nonplanar biphenyl spacer decreases the electronic communication between the donors and enhances the oxidation propensity of the corresponding dye. All the dyes display an intense longer wavelength electronic transition,which is attributable to the amine-to-cyanoacrylic acid charge transfer. The extinction coefficient of this peak grows dramatically on increasing the conjugation pathway length between the two donor segments. The dyes were used as sensitizers in nanocrystalline TiO 2-based dye-sensitized solar cells (DSSCs) and the cascade donor system contributed to the enhancement in the device efficiency due to favorable absorption and redox properties. © 2012 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.
Citation: Chemistry - An Asian Journal (2012), 7(4): 738-750
URI: https://doi.org/10.1002/asia.201100849
http://repository.iitr.ac.in/handle/123456789/3351
Issue Date: 2012
Keywords: absorption
amines
density functional calculations
donor-acceptor systems
dye-sensitized solar cells
ISSN: 18614728
Author Scopus IDs: 57203389297
36705999100
55050004100
56962715200
Author Affiliations: Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India
Kapoor, N., 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: Thomas, K.R.J.; Organic Materials Laboratory, 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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