Unlike simply providing a direct electron transport channel using one-dimensional (1D) nanowires/nanotubes in DSCs which would dramatically decrease the dye absorption and then lead to an uncompetitive efficiency [5] or utilizing semiconductor with higher electron mobility like ZnO which is unstable in acid or SnO2 having weak bonding with dye molecules [6], F-T film can shrink the transport distance of electron via FTO’s conductivity, maintain
a relative high dye loading level by TiO2 shell, and keep the stable nature of traditional photoanodes. It can also decouple the contradictory demand in bare TiO2 film between fast charge transport which desires heavy doping and less electron recombi-nation which desires light doping [2], because the light-injected electrons from the TiO2-dye interface in F-T DSCs only need to traverse a ultra thin layer of TiO2 prior to being extracted by the highly conductive FTO core via a drift-assisted transport [7] instead of diffusive transport [8] in bare TiO2 DSCs (a slow mechanism with electron escape times of 1-10 ms for 10-mm-thick TiO2 films)