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A Blue Diketopyrrolopyrrole Sensitizer with High Efficiency in Nickel-Oxide-based Dye-Sensitized Solar Cells

Abstract : We prepared a series of four new diketopyrrolopyrroles (DPPs)-based sensitizers that exhibit high-molar extinction coefficients, extended absorption into the long wavelengths, and well-suited photoredox properties to act as sensitizers in p-type dye-sensitized solar cells (p-DSSCs). These new DPP dyes, composed of a thienyl DPP core, are substituted on one end either by a thiophene carboxylic (Th) or a 4,4'-[(phenyl)aza]dibenzoic acid as anchoring group and, on the other extremity, either by a proton or a naphthalene diimide (NDI) moiety. These new dyes were completely characterized by absorption and emission spectroscopy along with electrochemistry and they were modeled by time-dependent DFT (TD-DFT) quantum chemical calculations. The photovoltaic study in p-DSSC with iodine-based electrolyte reveals that the Th-DPP-NDI dye is particularly efficient (J(sc) = 7.38 mA cm(-2); V-oc = 147 mV; FF = 0.32; eta = 0.35%) and quite active in the low-energy region of the solar spectrum (above 700 nm), where only a few NiO dyes are effective. To illustrate the potential of DPP dyes in photocathodes, we designed a highly efficient tandem DSSC composed of a TiO2 photoanode sensitized by the dye D35 and a NiO photocathode sensitized by Th-DPP-NDI. This tandem DSSC gives the highest performances ever reported (J(sc) = 6.73 mA cm(-2); V-oc = 910 mV; eta = 4.1%) and, importantly, the tandem cell outcompetes with the sub-cells.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01559212
Contributor : Laurent Jonchère <>
Submitted on : Monday, July 10, 2017 - 2:53:52 PM
Last modification on : Monday, March 16, 2020 - 3:34:02 PM

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Yoann Farré, Mahfoudh Raïssi, Arnaud Fihey, Yann Pellegrin, Errol Blart, et al.. A Blue Diketopyrrolopyrrole Sensitizer with High Efficiency in Nickel-Oxide-based Dye-Sensitized Solar Cells. ChemSusChem, ChemPubSoc Europe/Wiley, 2017, 10 (12), pp.2618--2625. ⟨10.1002/cssc.201700468⟩. ⟨hal-01559212⟩

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