Ultraviolet-O2 treatment TiO2/Ti anodes for use in Ti grids-based large-area flexible dye-sensitized solar cells

► A large-area flexible Pt/SWCNT counter electrode was prepared based on the Ti grid. ► A large-area flexible TiO2/Ti anode was fabricated on the Ti foil. ► The efficiency was increased by 10.21% using the ultraviolet-O2 treatment. ► The efficiency of the large-area (40 cm2) flexible DSSC reached 5.29%.