Sanchez Carballo, M.Urbani, M.Chandiran, A. KumarGonzalez-Rodriguez, D.Vazquez, P.Graetzel, M.Nazeeruddin, M. K.Torres, T.2014-11-132014-11-132014-11-13201410.1039/c4dt01357chttps://infoscience.epfl.ch/handle/20.500.14299/108649WOS:000343023200021We report on the synthesis, and photovoltaic performances of four novel Ru(II)-bipyridine heteroteptic complexes TT206-209, incorporating branched and bulkier alkyl chains compared to their linear analogues C106 and CYC-B11 previously reported. In both series, we found that dyes containing 2-methyl-hex-2-yl substitution gave better performances than 1,1-dipropylbutyl. The best overall performance over the four dyes was obtained for TT207 (CYC-B11 analogue), which contains 2-methylhex-2-yl type substitution, achieving an overall PCE of 8.5%. Furthermore, the optimization of TT207/DSSCs, with respect to the dye-uptake solvent and electrolyte composition, led to a maximum PCE of 9.1% under AM1.5 G standard conditions.text::journal::journal article::research article