| Popis: |
We report the successful synthesis of high-quality BiFeO 3 thin films on a SrRuO 3 /SrTiO 3 substrate using hydrothermal methods, and their structural, ferroelectric, and electrical properties. Using a low precursor concentration, we obtained compressively strained BiFeO 3 thin films (thickness: 60 nm) with smooth surface (roughness: 4.2 nm). The ferroelectric polarization of the BFO thin films was parallel with respect to the normal to the substrate and changed direction by 180° under the application of electric field. The current flowed unidirectionally; such rectifying behavior was attributed to Schottky barrier modulation by oxygen vacancies and ferroelectric polarization. Our results provide an important step in the applications of hydrothermally grown BiFeO 3 thin films like a large-area and low-cost photovoltaic device. |
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