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A Dendritic Oligothiophene Ruthenium Sensitizer for Stable Dye-Sensitized Solar Cells

Authors

  • Frédéric Sauvage Dr.,

    1. Laboratoire de Photonique et Interfaces, Institut des Sciences et Ingénieurie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015 Lausanne (Switzerland), Fax: (+41) 21-6934-1111
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  • Markus K. R. Fischer,

    1. Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm (Germany), Fax: (+49) 731-50-22840
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  • Amaresh Mishra Dr.,

    1. Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm (Germany), Fax: (+49) 731-50-22840
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  • Shaik M. Zakeeruddin Dr.,

    1. Laboratoire de Photonique et Interfaces, Institut des Sciences et Ingénieurie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015 Lausanne (Switzerland), Fax: (+41) 21-6934-1111
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  • Mohammad K. Nazeeruddin Dr.,

    1. Laboratoire de Photonique et Interfaces, Institut des Sciences et Ingénieurie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015 Lausanne (Switzerland), Fax: (+41) 21-6934-1111
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  • Peter Bäuerle Prof.,

    1. Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm (Germany), Fax: (+49) 731-50-22840
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  • Michael Grätzel Prof.

    1. Laboratoire de Photonique et Interfaces, Institut des Sciences et Ingénieurie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015 Lausanne (Switzerland), Fax: (+41) 21-6934-1111
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Abstract

We report a new type of dendritic terthiophene attached to a 2,2’-bipyridine ligand for ruthenium-based dye-sensitized solar cells. As a result of the incorporation of this electron-rich terthiophene donor unit into the heteroleptic ruthenium sensitizer [Ru(dcbpy)(3Tbpy)(NCS)2] (3T), the lowest-energy metal-to-ligand charge transfer (MLCT) transition is red-shifted and the molar extinction coefficient is increased compared to the analogous standard Z907Na sensitizer. A preliminary investigation of the 3T dye in combination with an iodine/iodide-based electrolyte shows an interesting photovoltaic performance, with a maximum power conversion efficiency of 7.4 % measured under air mass 1.5 global sunlight irradiation. Accelerated testing of these devices at 60 °C under full sunlight soaking shows a remarkable stability over 1000 h.

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