CHARACTERIZATION OF A COMPOSITE FILM PREPARED BY DEPOSITION OF TiO_2 ON POROUS Si

摘要

TiO_2 thin films were prepared on electrochemically etched porous Si by anodic oxidative hydrolysis of TiCl_3 for the purpose of solar cell application. We compared electrochemical and photoelec-trochemical properties of the TiO_2-deposited porous Si electrodes (TiO_2/porous Si) with those of a porous Si electrode. The TiO_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_2 thin layer. Li~+ and Na~+ ions exhibited intercalation and deintercalation through the electrodeposited TiO_2 film.