I—V curves of the solid-state Ti02 dye PED0T-PED0T FT0 solar cells in the presence of the BMImTFSI electrolyte. The improvement of the cell performances over time is ostensibly due to a better percolation of the ionic liquid into the Ti02 mesopores. Reprinted from Ref. 81. Copyright 2008 with permission from Elsevier.