|Title:||Effect of Donors on Photophysical, Electrochemical and Photovoltaic Properties of Benzimidazole-Branched Dyes|
Justin Thomas, K. R.
|Abstract:||A series of benzimidazole-branched organic dyes containing different donors such as carbazole or phenothiazine at C4 and C7 positions of benzimidazole, bithiophene linker and cyanoacrylic acid acceptor are reported. Incorporation of donors increased the molar extinction coefficient of the intramolecular charge transfer absorption peak and contributed to the enhanced photocurrent generation than the control dye without donors. The favourable properties of the new dyes are attributed to the suitable HOMO and LUMO energy levels which facilitated dye regeneration and electron injection from the excited state of the dyes into the conduction band of TiO 2 . The dye-sensitized solar cells fabricated using the dyes possessing phenothiazine-based donor yielded better efficiency than the dyes containing carbazole donor. It is attributed to the effective retardation of electron recombination resulting from the non-planar molecular geometry of the former. These results suggest that opportunities exist for the improvement of benzimidazole-based organic dyes. Â© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim|
|Citation:||ChemistrySelect (2017), 2(9): 2807-2814|
|Keywords:||density functional theory|
dye-sensitized solar cells
|Author Scopus IDs:||56401178900|
|Author Affiliations:||Bodedla, G.B., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India|
Thomas, K.R.J., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, 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:||KRJT is thankful to CSIR (Ref. 02/(0230)/15/EMR-II dated 05â€“06-2015), New Delhi and DST (Ref. DST/TSG/PT/2013/09), New Delhi for financial support. We are thankful to DST for the purchase of ESI mass spectrometer through 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: email@example.com|
|Appears in Collections:||Journal Publications [CY]|
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