Farré Yoann, Raissi Mahfoudh, Fihey Arnaud, Pellegrin Yann, Blart Errol, Jacquemin Denis, Odobel Fabrice
Université LUNAM, Université de Nantes, CNRS, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UMR 6230, 2 rue de la Houssinière, 44322, Nantes cedex 3, France.
Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes1, 263 Av. du Général Leclerc, 35042, Cedex Rennes, France.
ChemSusChem. 2017 Jun 22;10(12):2618-2625. doi: 10.1002/cssc.201700468. Epub 2017 May 22.
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 =7.38 mA cm ; V =147 mV; FF=0.32; η=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 TiO 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 =6.73 mA cm ; V =910 mV; η=4.1 %) and, importantly, the tandem cell outcompetes with the sub-cells.
我们制备了一系列四种基于二酮吡咯并吡咯（DPP）的新型敏化剂，它们具有高摩尔消光系数、长波长吸收范围扩展以及适合作为p型染料敏化太阳能电池（p-DSSC）敏化剂的光氧化还原特性。这些新型DPP染料由噻吩基DPP核心组成，一端被噻吩羧酸（Th）或4,4'-[(苯基)氮杂]二苯甲酸作为锚定基团取代，另一端被质子或萘二酰亚胺（NDI）部分取代。通过吸收光谱、发射光谱以及电化学对这些新型染料进行了全面表征，并通过含时密度泛函理论（TD-DFT）量子化学计算对其进行了建模。在基于碘电解质的p-DSSC中的光伏研究表明，Th-DPP-NDI染料特别高效（J =7.38 mA cm ；V =147 mV；FF=0.32；η=0.35 %），并且在太阳光谱的低能量区域（高于700 nm）相当活跃，在该区域只有少数NiO染料有效。为了说明DPP染料在光阴极中的潜力，我们设计了一种由染料D35敏化的TiO光阳极和由Th-DPP-NDI敏化的NiO光阴极组成的高效串联DSSC。这种串联DSSC给出了有史以来报道的最高性能（J =6.73 mA cm ；V =910 mV；η=4.1 %）重要的是，串联电池优于子电池。
