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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3303
Title: Synthesis and characterization of thieno[3,4-d]imidazole-based organic sensitizers for photoelectrochemical cells
Authors: Karthik D.
Kumar V.
Justin Thomas K.R.
Li C.-T.
Ho K.-C.
Published in: Dyes and Pigments
Abstract: Six organic sensitizers containing thieno[3,4-d]imidazole chromophore were synthesized and characterized by photophysical, electrochemical and photovoltaic studies. N-alkylated derivatives containing thiophene substituents showed blue-shifted absorption when compared to the dyes containing 4-tert-butyl-phenyl group attributable to the disturbance in the conjugation due to tilting in the structure. However, the former dyes exhibited red-shifted absorption when anchored on TiO2 due to enhanced aggregation. All dyes displayed negative solvatochromism in the absorption spectra indicating the charge transfer character and polar ground state. They exhibited low oxidation potentials than the dyes, known in the literature, which possess imidazole-based donor. Among the dyes, a dye containing bithiophene in the conjugation and thiophenes on thieno[3,4-d]imidazole nucleus showed best photovoltaic performance with η = 2.78%, Jsc = 7.91 mA cm-2 and ff = 0.63. Electrochemical impedance spectroscopy studies on the devices established the relationship between the functional chromophores on the electron injection and electron recombination kinetics. © 2016 Elsevier Ltd. All rights reserved.
Citation: Dyes and Pigments (2016), 129(): 60-70
URI: https://doi.org/10.1016/j.dyepig.2016.02.009
http://repository.iitr.ac.in/handle/123456789/3303
Issue Date: 2016
Publisher: Elsevier Ltd
Keywords: Dye-sensitized solar cells
Electrochemical impedance spectra
Optical spectra
Organic dyes
TDDFT computations
Thieno[3,4-d]imidazole
ISSN: 1437208
Author Scopus IDs: 57195605812
57203774869
57203389297
55507636700
56962715200
Author Affiliations: Karthik, D., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Kumar, V., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Justin Thomas, K.R., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
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
Funding Details: Financial support from CSIR (Ref. No. 02/(0230)/15/EMR-II dated 05-06-2015), New Delhi to KRJT is gratefully acknowledged and DST for HRMS facility via FIST Program to the Chemistry Department. DK thanks UGC, New Delhi for research fellowship. Appendix A
Corresponding Author: Justin Thomas, K.R.; 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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