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The Cu2O/TiO2 inverse opal heterojunction arrays were developed by electrochemical deposition of Cu2O nanoparticles on TiO2 inverse opal arrays. The Cu2O nanoparticles com- pletely filled the inner pores of TiO2 inverse opal film (prepared by liquid phase deposition with an average thickness of 400 nm) and covered the entire area; exhibiting high crystalline properties of anatase and cubic phase from TiO2 and Cu2O, respectively. From asymmetric cur- rent-voltage profile, it was noticeable that a heterojunction was well formed for charge transport from Cu2O to TiO2 film resulting from the enhanced charge separation yield. In addition, increased photocurrent of 0.19 mA/cm 2 (versus 0.08 mA/cm 2 under dark condition) was obtained at −0.35 V from the heterojunction structure in the 0.5 M Na2SO4 solution.

Preparation and Photoelectrochemical Behavior of Cu2O/TiO2Inverse Opal Heterojunction Arrays

Preparation and Photoelectrochemical Behavior of Cu₂O/TiO₂Inverse Opal Heterojunction Arrays