Abstract
An SnO₂ layer prepared from ethanol solution was applied to fabricate an FTO/SnO₂/BiVO₄ composite photo-electrode. The layered composite films were characterized by XRD, SEM and XPS techniques. The photocurrent efficiency of BiVO₄ increased remarkably when an SnO₂ film was layered between the BiVO₄ layer and the FTO conducting electrode, indicating the efficient charge separation via the electron transfer from to SnO₂ and the blocking of the hole transfer from BiVO₄ to the FTO surface. It was also demonstrated that the sequence for depositing the individual metal oxide layer on the FTO substrate was an important factor for such efficient charge separation of electrode.

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