|Title:||Effect of auxiliary chromophores on the optical, electrochemical, and photovoltaic properties of carbazole-based dyes|
Justin Thomas K.R.
|Published in:||Asian Journal of Organic Chemistry|
|Abstract:||Organic dyes containing 2-diphenylaminocarbazole donors and decorated with auxiliary chromophores at the diphenylamine moiety have been synthesized and characterized. The nature of the chromophores on diphenylamine unit alters the light-harvesting properties and HOMO/LUMO energies of the dyes. Butoxy substitution raises the HOMO and lowers the LUMO energies. But the incorporation of fluorenyl units fine-tunes the LUMO upwardly, which improves the thermodynamic driving force for electron injection into the conduction band of TiO2 and hikes the incident photon-to-current conversion efficiency. Consequently, a dye with fluorene in the donor unit and thiophene in the Ï€-conjugation pathway is the most efficient (5.76%) and has the highest photocurrent density (14.60mAcm-2) in the series. Electrochemical impedance analysis of the devices showed the importance of fluorene units in suppressing electron recombination. Â© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Citation:||Asian Journal of Organic Chemistry (2015), 4(1): 69-80|
Dye-sensitized solar cells
Electrochemical impedance spectroscopy
|Author Scopus IDs:||37051266500|
|Author Affiliations:||Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India|
Justin Thomas, K.R., 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:||Justin Thomas, K.R.; Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology RoorkeeIndia|
|Appears in Collections:||Journal Publications [CY]|
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