Abstract
BiFeO3 polycrystalline film has been fabricated using the sol–gel method. X-ray diffraction results indicate that the film adopts random orientation. Ultraviolet–visible (UV–Vis) absorption spectroscopy results show that the film exhibits intense absorbance around 450 nm and a bandgap of 2.66 eV. A significant photovoltaic effect was observed in the BiFeO3 film. The short-circuit current density and open-circuit voltage of the unpolarized film were 6.39 × 10−5 A/m2 and 0.21 V, respectively. After polarizing with +15 V and −20 V, the short-circuit current density increased to 9.55 × 10−5 A/m2 and 88.98 × 10−5 A/m2, respectively. The direction of the short-circuit current could be switched by polarization. The mechanism of the photovoltaic effect was interpreted based on ferroelectric polarization combined with a Schottky barrier model.
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The work is supported by the Key Program of Hubei Province Education Committee under Grant No. D2012206 and National Natural Science Foundation of China Grant No. 11274104.
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Sun, Y., Liu, X., Zeng, J. et al. Photovoltaic Effects in Polarized Polycrystalline BiFeO3 Films. J. Electron. Mater. 44, 4207–4212 (2015). https://doi.org/10.1007/s11664-015-3918-y
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DOI: https://doi.org/10.1007/s11664-015-3918-y