1. Dielectric and ferroelectric photovoltaic properties of epitaxial BiFeO3 film with La0.5Sr0.5CoO3 bottom electrode.
- Author
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Wang, Y. M., Zhang, X. G., Zeng, H. Y., Ji, S. Y., Fan, X. Y., Li, H. Y., Yin, Y. L., Yi, Z. R., Li, G., and Song, J. M.
- Subjects
FERROELECTRIC thin films ,DIELECTRICS ,FERROELECTRICITY ,LEAD titanate ,OPEN-circuit voltage ,FERROELECTRIC capacitors ,PHOTOVOLTAIC effect - Abstract
In order to deeply investigate the dielectric and ferroelectric photovoltaic properties of BiFeO
3 (BFO) thin films, the Pt/BFO/La 0. 5 Sr 0. 5 CoO3 (LSCO) heterostructure ferroelectric capacitor grown on (001) SrTiO3 (STO) substrate is successfully fabricated by off-axis magnetron sputtering. The X-ray diffraction (XRD) and Phi scanning results show that the STO-based BFO and LSCO films are both (001) epitaxial structure. Although the BFO ferroelectric film exhibits an obvious dielectric dispersion phenomenon, a remarkable ferroelectric photovoltaic performance is obtained with open circuit voltage ( V OC ) of 0.38 V and short-circuit current ( J SC ) of 0.23 mA/cm2 , respectively. With increasing test temperatures, V OC decreases slowly and then rapidly, while J SC increases rapidly and then decreases. At a critical temperature of 80∘ C, the BFO ferroelectric film exhibits a faster photovoltaic response, in which the values of V OC and J SC are about 0.19 V and 0.28 mA/cm2 , respectively. Moreover, the energy band analysis indicates that a large work function difference (∼ 1 eV) between LSCO and Pt leads to a strong built-in electric field in the BFO film, which is beneficial to separate the photo-generated carriers and improve ferroelectric photovoltaic effect. In all, this study not only shows that BFO is an excellent and environmentally friendly photovoltaic candidate material, but also provides a practical strategy for improving the performance of BFO ferroelectric photovoltaic devices. [ABSTRACT FROM AUTHOR]- Published
- 2024
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