Comparison of Anatase and Rutile TiO₂ Thin Films via Sol-Gel Route for Their Use in Dye-Sensitized Solar Cells

This Study of electronic properties of TiO₂ anatase and rutile thin films show that anatase has properties different from those of the well-known rutile phase. A larger effective Bohr radius of donor electrons is observed in anatase than in rutile, which in turn suggests a smaller electron effective mass in anatase. The smaller effective mass in anatase is consistent with the high mobility. Anatase thin films have a wider optical absorption gap than rutile thin films as confirmed by photoluminescence spectra.