4 years ago

Structural Effect of Pendant Unit in Thiocyanate-Free Ru(II) Sensitizers on Dye-Sensitized Solar Cell Performance

Shogo Mori, Mutsumi Kimura, Takahiro Kono, Rei Tamura
Combination of Ru complex sensitizers and Co complex redox couples for dye-sensitized solar cells (DSSCs) generally results in low power conversion efficiency. This has been interpreted with the facilitation of undesired electron transfer due to strong intermolecular interactions between the dye and the redox couple. To retard the interactions, two thiocyanate-free ruthenium (Ru) sensitizers attached with a triphenylamine (TPA) unit are synthesized by adding branched alkoxy chains to the TPA unit (T11) and making rigid bonding angle between the TPA and the terpyridine ligand (T12). DSSCs using T11 shows increased short-circuit current in comparison to that using a Ru complex dye having non-branched alkyl chains and DSSCs using T12 shows high open circuit voltage. T12 also displays relatively high power conversion efficiency without coadsorption of chenodeoxycholic acid, suggesting less intermolecular interaction among dyes and thus also with Co complex redox couples.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700899

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