With the aim of obtaining TiO2 films with increased photoresponse titanium metal was alloyed with bismuth and then directly oxidized. The free energy efficiencies of the Ti-Bi oxide increased four times by increasing the bismuth content up to 10 wt %. The spectral response of the Ti-Bi oxides was slightly shifted toward the visible region with respect to the response of TiO2, and their E(g) were observed to be in the range 2.87-3.0 eV.