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Synthesis and properties of novel pyranylidene-based organic sensitizers for dye-sensitized solar cells

Abstract : We report herein the synthesis of nine new molecularly engineered metal-free organic pyranylidene-based dyes as efficient photosensitizers for Dye-Sensitized Solar Cells (DSSCs). Their photophysical, electrochemical, and photovoltaic properties were investigated, and their excited states have been modelled using Time-Dependent Density Functional Theory (TD-DFT). The investigation of the photovoltaic performances of this series of new dyes provided structure-property relationships where their Power Conversion Efficiencies (PCE) could be correlated to structural features, such as the length of the π-conjugated spacer and the nature of the substituents on the upper (positions 2 and 6) and lower parts (substituents on the exocyclic carbon) of the pyranylidene electron donor moiety. While these dyes fulfilled the criteria of efficient sensitizers for TiO2-based DSSCs, their photovoltaic performances were found to depend on the dye packing arrangements controlled by substituents on the pyranylidene group. The highest Power Conversion Efficiency of 5.52% was reached with the 20a dye containing phenyl substituent groups in both upper and lower parts of the pyranylidene fragment and with one thienyl π-conjugated spacer. © 2019 Elsevier Ltd
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02281770
Contributor : Laurent Jonchère <>
Submitted on : Monday, September 9, 2019 - 2:51:27 PM
Last modification on : Friday, July 10, 2020 - 4:03:18 PM

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S. Gauthier, F. Robin-Le Guen, Laurianne Wojcik, Nicolas Le Poul, A. Planchat, et al.. Synthesis and properties of novel pyranylidene-based organic sensitizers for dye-sensitized solar cells. Dyes and Pigments, Elsevier, 2019, 171, pp.107747. ⟨10.1016/j.dyepig.2019.107747⟩. ⟨hal-02281770⟩

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