New anomalous photocurrent peak of the TiO2−x thin film electrodes

Abstract

A titanium oxide thin film (TOTF) has been prepared by reaction of titanium sheet (99.9%, 1/2 mm thick) with water vapor at 600 °C. The electrical conductivity is n type, and the resistivity is of about 10 Ω cm. The photoelectroylsis reveals that the TOTF responds to the light of three-spectral regions, one in 280–420 nm region corresponding to the well-known TiO2 band and others centered at 490 and 589 nm, respectively, which are hitherto not reported. The latter are assigned to the subband gap states responsible for reducing oxygen molecules at the TOTF-electrolyte interface.