Abstract
The possibility of extending the optical absorption range of TiO 2 thin films into the visible region of the solar spectrum was investigated. An impurity doping approach utilizing chromium and cadmium dopants was used. Films were prepared utilizing a d.c. triode sputtering system using three different doping techniques. Curves showing the dependence of the absorption coefficient on wavelength are given for the undoped as well as for the doped material. The results show that, similar to bulk TiO 2 materials, transition metal doping of Thin TiO 2 films could be a viable technique for extending their optical absorption to the visible range of the solar spectrum.
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