Cobalt and yttrium modified TiO$_2$ nanotubes based dye-sensitized solar cells for solar-energy conversion

The solar-energy conversion in eosin-sensitized solar cells based on cobalt and yttrium modified TiO$_2$ nanotubes has been studied.It is established that the doping with metal ions shifts the absorption edge for Co and Y doped titanium dioxide samples to longer and shorter wavelengths, respectively. The efficiency of solar energy conversion depends on the wide bandgap of the semiconductor anode and reaches a maximum (4.4%) for yttrium-doped TiO$_2$ in comparison to that (4.1%) for pure titanium dioxide.