高温酸化により作製したTiO₂皮膜の光アノード分極特性に及ぼす作製時における酸素分圧の効果

抄録

The effect of oxygen pressure during oxidation on the photo-anodic polarization behavior of TiO₂ films formed by high-temperature oxidation was investigated in a Na₂SO₄ solution. Large photoanodic currents were observed for films formed by oxidation at low oxygen pressures. The donor concentration in films increased with the decrease in oxygen pressure during oxidation. This corresponded to the increase in the photoanodic current. The increase in photoanodic current with decreasing oxygen pressure during film formation was therefore explained by the photoanodic reaction model in which the reaction proceeded through the surface state corresponding to excessive titanium ions on the film surface.