Electron injection studies in TiO2 nanocrystalline films sensitized with fluorene dyes and photovoltaic characterization. The effect of co-adsorption of a bile acid derivative

► Electron injection in TiO2 films sensitized with fluorene dyes is studied. ► Femtosecond time resolved fluorescence spectroscopy is used. ► Electron injection is correlated to the dyes' structure and excited state potential. ► The effect of a co-adsorbent has been examined. ► Quasi-solid solar cells have been fabricated and characterized.