Ecole Polytechnique Federale De Lausanne

Ecole Polytechnique Féderale De Lausanne (epfl)

Michaël Graetzel

Shaik Mohammad Zakeeruddin

Peng Wang

Cédric Klein

Daibin Kuang

The present invention relates to electrolytes comprising tetracyanoborate and an organic cation as components of electrolytes in electrochemical and/or optoelectronic devices, in particular solar cells. This ionic liquid has low viscosity and can be used as electrolyte in the absence of a solvent. Importantly, the ionic liquid remains stable in solar cells even after prolonged thermal stress at 80&#xb0; C. for 1000 hours. Photovoltaic conversion efficiency remained stable and keeping more than 90% of the initial value.

Ionic liquid electrolyte

A dye sensitized solar cell, comprising a-heteroleptic polypyridil complex of Ru, Os or Fe. The donating ligand has an extended conjugated n-system increasing the light absorbance and keeing the LUMO energy level higher than that of the anchoring ligand. A compacting compound whose molecular structure comprises a terminal group, a hydrophobic part and an anchoring' group may be co-adsorbed together with the dye on the semi-conductive metal oxide layer of the photoanode, forming a dense mixed self-assembled monolayer.

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St-Sulpice, Switzerland

Michaël Graetzel