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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3324
Title: Organic dyes containing carbazole as donor and Ï€-linker: Optical, electrochemical, and photovoltaic properties
Authors: Venkateswararao A.
Thomas K.R.J.
Lee C.-P.
Li C.-T.
Ho K.-C.
Published in: ACS Applied Materials and Interfaces
Abstract: A series of new metal free organic dyes containing carbazole as donor and Ï€-linker have been synthesized and characterized as effective sensitizers for dye sensitized solar cells (DSSCs). The carbazole functionalized at C-2 and C-7 served as electron-rich bridge. The donor property of the carbazole is substantially enhanced on introduction of tert-butyl groups at C-3 and C-6 positions and the oxidation propensity of the dyes increased on insertion of thiophene unit in the conjugation pathway. These structural modifications fine-tuned the optical and electrochemical properties of the dyes. Additionally, the presence of tert-butyl groups on the carbazole nucleus minimized the intermolecular interactions which benefited the performance of DSSCs. The dyes served as efficient sensitizers in DSSCs owing to their promising optical and electrochemical properties. The efficiency of DSSCs utilizing these dyes as sensitizers ranged from 4.22 to 6.04%. The tert-butyl groups were found to suppress the recombination of injected electrons which contributed to the increment in the photocurrent generation (JSC) and open circuit voltage (VOC). A dye with carbazole donor functionalized with tert-butyl groups and the conjugation bridge composed of 2,7-disubstituted carbazole and thiophene fragments exhibited higher VOC value. However, the best device efficiency was observed for a dye with unsubstituted carbazole donor and the Ï€-linker featuring carbazole and bithiophene units due to the high photocurrent generation arising from the facile injection of photogenerated electrons into the conduction band of titanium dioxide (TiO 2) facilitated by the low-lying LUMO. © 2014 American Chemical Society.
Citation: ACS Applied Materials and Interfaces (2014), 6(4): 2528-2539
URI: https://doi.org/10.1021/am404948w
http://repository.iitr.ac.in/handle/123456789/3324
Issue Date: 2014
Keywords: absorption
carbazole
dye-sensitized solar cells
electrochemistry
organic dyes
TDDFT computations
ISSN: 19448244
Author Scopus IDs: 37051266500
57203389297
55050004100
55507636700
56962715200
Author Affiliations: Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India
Thomas, K.R.J., 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
Li, C.-T., 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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