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Issue 21, 2013
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Structural variations of D–π–A dyes influence on the photovoltaic performance of dye-sensitized solar cells

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Abstract

Two new organic D–π–A dyes containing identical π-conjugated spacer and anchoring/acceptor moieties but different donor groups were designed and synthesized. These dyes containing didodecyl-cyclopentadithiophene (CPDT) as a spacer, cyanoacrylic acid as an acceptor and N-butyl-carbazole or N-butyl-phenothiazine moieties as electron donor groups are labelled as V4 and V11 dyes, respectively. The variation in the donor group of these two dyes, that influences the photophysical, electrochemical and photovoltaic parameters, was investigated. The highest photovoltaic conversion efficiency of 7.5% was obtained with V4 dye at AM 1.5 G full sunlight intensity (100 mWcm−2). Comparison of phenothiazine donor dyes with two different π-conjugated spacers, CPDT (V11) and vinyl thiophene (V7) containing devices shows that the Voc of V7 dye is lower than that of V11 due to the downward shift of the conduction band edge. Transient photovoltage and electrochemical impedance spectroscopy measurements were performed to explain the differences in the PV parameters by varying the donors and/or spacer groups.

Graphical abstract: Structural variations of D–π–A dyes influence on the photovoltaic performance of dye-sensitized solar cells

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Publication details

The article was received on 23 Sep 2012, accepted on 14 Mar 2013 and first published on 14 Mar 2013


Article type: Paper
DOI: 10.1039/C3RA22249G
Citation: RSC Adv., 2013,3, 7921-7927
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    Structural variations of D–π–A dyes influence on the photovoltaic performance of dye-sensitized solar cells

    M. Marszalek, S. Nagane, A. Ichake, R. Humphry-Baker, V. Paul, S. M. Zakeeruddin and M. Grätzel, RSC Adv., 2013, 3, 7921
    DOI: 10.1039/C3RA22249G

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