Stengel, IlonaPootrakulchote, NuttapolDykeman, Ryan R.Mishra, AmareshZakeeruddin, Shaik M.Dyson, Paul JosephGraetzel, MichaelBaeuerle, Peter2013-02-272013-02-272013-02-27201210.1002/aenm.201100722https://infoscience.epfl.ch/handle/20.500.14299/89712WOS:000307343900015Three heteroleptic ruthenium complexes incorporating new ancillary ligands synthesized by sequential connection of different alkyl functionalities with triazole as a linker are prepared using click chemistry. These sensitizers exhibit low-energy metal-to-ligand charge transfer bands centered at 540 nm with molar extinction coefficients of up to 1.54 x 10(4) L mol-1 cm-1. The devices using these sensitizers in conjunction with a volatile electrolyte show high photovoltaic conversion efficiencies of 8.7 to 9.9% under standard AM 1.5G sunlight (100 mW cm-2) conditions. Using an ionic liquid electrolyte, the cells show not only a good power-conversion efficiency of up to 7.1%, but also promising long-term stability under full sunlight intensity at 60 degrees C. The difference in the photovoltaic parameters during the ageing process is investigated by employing transient photoelectrical measurements.Ru(II)complexclick chemistrydye-sensitized solar cellsredox mediatorsdevice stabilitytext::journal::journal article::research article