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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3375
Title: 2,3-disubstituted thiophene-based organic dyes for solar cells
Authors: Thomas K.R.J.
Hsu Y.-C.
Lin J.T.
Lee K.-M.
Ho K.-C.
Lai C.-H.
Cheng Y.-M.
Chou P.-T.
Published in: Chemistry of Materials
Abstract: New organic dyes that contain variable lengths of conjugation, featuring oligothiophene and arylamines at the 2- and 3-position, have been synthesized. These compounds are characterized by photophysical, electrochemical, and theoretical computational methods. Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells range from 4.11 to 6.15%, compared to a cis-di(thiocyanato)-bis(2,2′- bipyridyl)-4,4′-dicarboxylate ruthenium(II)-sensitized device (7.86%) fabricated and measured under similar conditions. The devices made from these compounds have higher open-circuit voltage (Voc) compared to oligothiophene congeners with arylamines at the 2-position only. The hydrophobic segment at the 3-position appears to help retarding the charge transfer from the conduction band of TiO2 to the electrolyte, I3 -. Supplementary studies of the transient photovoltage and electrochemical impedance are in support of retarded charge transfer of TiO 2 (e-) with both oxidized sensitizer and I 3-. Computation on a pair of compounds with and without arylamines at 3-position indicates that the former has larger charge transfer efficiency at the electronically excited state. © 2008 American Chemical Society.
Citation: Chemistry of Materials (2008), 20(5): 1830-1840
URI: https://doi.org/10.1021/cm702631r
http://repository.iitr.ac.in/handle/123456789/3375
Issue Date: 2008
ISSN: 8974756
Author Scopus IDs: 57203389297
7401583510
7501725859
7501498671
56962715200
57154922000
13310034400
7201966354
Author Affiliations: Thomas, K.R.J., Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
Hsu, Y.-C., Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
Lin, J.T., Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan, Department of Chemistry, National Central University, Chungli 320, Taiwan
Lee, K.-M., Institute of Polymer Science and Engineering, National Taiwan University, Taipei 106, Taiwan
Ho, K.-C., Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan, Institute of Polymer Science and Engineering, National Taiwan University, Taipei 106, Taiwan
Lai, C.-H., Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Cheng, Y.-M., Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Chou, P.-T., Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
Corresponding Author: Lin, J. T.; Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan; email: jtlin@chem.sinica.edu.tw
Appears in Collections:Journal Publications [CY]

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