Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Power conversion efficiencies (PCEs) achieved by Dye-Sensitized Solar Cells (DSCs) have been limited by the nature of redox couples used. The introduction of Cobalt-based redox shuttles gave a second chance to the field of DSCs and record PCEs were achieved. However, cobalt-based redox shuttles resulted in a worse performance of DSCs employing Ruthenium-based sensitizer. In this work we approached this issue by synthesizing six new cyclometalated tris-heteroleptic Ru(II) complexes (SA22, SA25, SA246, SA282, SA284, SA285). All these complexes have similar cyclometalated and anchoring ligands, but various auxiliary ligands. We show that modifying the aromatic substituents on the 4,4’-positions of the auxiliary 2,2’-bypyridine ligand one may fine-tune the photo-physical properties of the sensitizer. Despite having minor differences in their structure, these sensitizers result in drastically different performances in DSCs. With iodine-based devices, mediocre PCEs were achieved. We show that iodine-sulfur interactions play a major role in increasing the rates of benign regeneration and malign recombination, with the latter one being more prominent. Here we report the record PCE 9.4 % achieved with the device based on Ru-Co system, cobalt-based electrolytes and SA246. Experiments that are used to support our results include transient absorbance measurements, electrochemical impedance measurements and X-ray photoelectron spectroscopy and theoretical calculations.
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