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Dye-Sensitized Solar Cells using Fluorone-based Ionic Liquids with improved Cell Efficiency

Abstract

Six trihexyltetradecylphosphonium chloride (P6,6,614Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye; Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosine B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1-2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) and trihexytetradecylphosphonium dianions (from a´ to f´), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW/cm2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30% increase in the cell photovoltaic conversion efficiency. Also, for Eosyn B the presence of electron-donating groups and an auxiliary electron-withdrawing group, -NO2, allows reduction of the nitro group to -NO2-. This provides a new interaction between the nitro and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.85% efficiency after light DSSC soaking. Factors that improve DSSC performance like, aggregate inhibition, increment of the electrode’s quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes was achieved by simple cationic exchange.

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Publication details

The article was accepted on 29 Sep 2019 and first published on 30 Sep 2019


Article type: Paper
DOI: 10.1039/C9SE00783K
Sustainable Energy Fuels, 2019, Accepted Manuscript

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    Dye-Sensitized Solar Cells using Fluorone-based Ionic Liquids with improved Cell Efficiency

    C. Pereira, A. L. Pinto, A. J. Parola, J. P. Leal and I. Coutinho, Sustainable Energy Fuels, 2019, Accepted Manuscript , DOI: 10.1039/C9SE00783K

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