Remarkable Improvement of Ferroelectric Properties and Leakage Current in BiFeO3 Thin Films by Nd Modification
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第1期
论文作者：韩冬 王华 XU Jiwen ZHANG Xiaowen YANG Ling
文章页码：64 - 67
摘 要：Ferroelectric and leakage properties are important for ferroelectric applications. Pure and Nd-doped（x=0.05-0.20） BiFeO3 thin films were fabricated by sol-gel method on FTO substrates. The phase structure, surface morphology, leakage current, ferroelectric properties, and optical properties of BiFeO3-based thin films were investigated. The substitution of Nd3+ ions for the Bi3+ site converts the structure from rhombohedral to coexisting tetragonal and orthorhombic. Nd doping improves the crystallinity of BiFeO3 thin films. The leakage current of Nd-doped BiFeO3 decreases by two to three orders of magnitude compared with that of pure BiFeO3. Among the samples, 15% Nd-doped BiFeO3 exhibits the strongest ferroelectric polarization of 17.96 μC/cm2. Furthermore, the absorption edges of Bi1-xNdxFeO3 thin films show a slight red-shift after Nd doping.
韩冬，王华，XU Jiwen，ZHANG Xiaowen，YANG Ling
School of Materials Science and Engineering, Guilin University of Electronic Technology
摘 要：Ferroelectric and leakage properties are important for ferroelectric applications. Pure and Nd-doped（x=0.05-0.20） BiFeO3 thin films were fabricated by sol-gel method on FTO substrates. The phase structure, surface morphology, leakage current, ferroelectric properties, and optical properties of BiFeO3-based thin films were investigated. The substitution of Nd3+ ions for the Bi3+ site converts the structure from rhombohedral to coexisting tetragonal and orthorhombic. Nd doping improves the crystallinity of BiFeO3 thin films. The leakage current of Nd-doped BiFeO3 decreases by two to three orders of magnitude compared with that of pure BiFeO3. Among the samples, 15% Nd-doped BiFeO3 exhibits the strongest ferroelectric polarization of 17.96 μC/cm2. Furthermore, the absorption edges of Bi1-xNdxFeO3 thin films show a slight red-shift after Nd doping.
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