LAUSR

Abstract Various Li-doped TiO2 films with different doping concentration were successfully synthesized by a thermal treatment at 500 °C. With the incorporation of Li+, anatase TiO2 transformed obviously to rutile at lower temperature (500 °C) and the increasing concentration of Li+ can promote the growth of crystals. All films have good transmittance (average transmittance >75%) in the visible region, the optical band gap (Eg) of TiO2 narrowed from 3.71 eV to 3.63 eV and reached the minimum at 5.0 mol%. Moreover, an optimized carrier concentration of 6.43 * 1010 cm−3 and the resistivity of 4.06 * 105 Ω.cm were obtained after 5.0 mol% Li+ doping. Possible mechanisms for the effect of Li-doping on the carrier concentration and resistivity were discussed. In conclusion, the Li-doped TiO2 films have potential applications for solar cell.