Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2757132
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BiFeO3 films prepared by pulsed laser deposition on Pt/TiO2/SiO2/Si substrates were studied as photoelectrode for water splitting. Under visible-light irradiation, the photocurrent intensity of the polycrystalline BiFeO3 film was found to double that of the amorphous one in a three-electrode cell. The incident photon to current conversion efficiency for the polycrystalline BiFeO3 electrode was approximately 16% at 350 nm and 7% at 530 nm at 1.5 V (versus saturated calomel electrode). The ferromagnetism of the amorphous BiFeO3 film was an order of magnitude weaker than that of the polycrystalline one, supporting the size effect explanation for magnetic origin. (C) 2007 American Institute of Physics.
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