Characterization of a composite film prepared by deposition of TiO sub(2) on porous Si

TiO sub(2) thin films were prepared on electrochemically etched porous Si by anodic oxidative hydrolysis of TiCl sub(3) for the purpose of solar cell application. We compared electrochemical and photoelectrochemical properties of the TiO sub(2)-deposited porous Si electrodes (TiO sub(2)/porous Si) with those of a porous Si electrode. The TiO sub(2)/porous Si showed prolonged stability of photoluminescence and enhancements of photovoltage and photocurrent by 0.13 V and 67% increase, respectively, in comparison with porous Si due to the reduction of surface traps for charge carriers in the presence of TiO sub(2) thin layer. Li super(+) and Na super(+) ions exhibited intercalation and deintercalation through the electrodeposited TiO sub(2) film.