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Insights into the limitations of solar cells sensitized with ruthenium dyes revealed in time-resolved spectroscopy studies

Abstract

The substitution of iodide electrolyte with cobalt ones has led to the current champion laboratory efficiencies for dye-sensitized solar cells (DSSC). However, unlike with organic dyes, this strategy does not work with classical ruthenium dyes. Therefore, we compare DSSCs sensitized with popular Ru dye (N719) using both types of electrolytes by exploring the electron dynamics occurring from sub-ps to seconds. An important limitation in the photocurrent of cobalt-based cells is revealed to be due to electron recombination between titania and oxidized Ru dyes, which is much higher than that in iodide-based cells and occurs on the time scale of tens and hundreds of ps. Electron recombination between titania and electrolyte, taking place on millisecond time scale, is responsible for further lowering of photovoltage and fill factor of cobalt-based cells. Ruthenium dyes exhibit also lower absorption coefficients with respect to their organic counterparts. For this reason we also investigate the effect of the changes in the titania layer thickness, addition of scattering nanoparticles and modifications in the TiCl4 treatment on the DSSC performance.

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Publication details

The article was accepted on 07 Jul 2017 and first published on 07 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP03566G
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Insights into the limitations of solar cells sensitized with ruthenium dyes revealed in time-resolved spectroscopy studies

    M. Gierszewski, I. Grądzka, A. Glinka and M. Ziolek, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP03566G

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