Co-sensitization of amphiphilic ruthenium (II) sensitizer with a metal free organic dye: Improved photovoltaic performance of dye sensitized solar cells

► Ru based dye (Ru) and metal free dye (Y3) were used for the fabrication of co- sensitized DSSCs. ► DSSC based on co-sensitization of Ru and Y3 showed efficiency about 6.29%. ► This efficiency is higher than that for individual based DSSCs. ► The enhanced efficiency was attributed to the reduction charge recombination.