Comparative study on substitution effects in BiFeO3 thin films fabricated on FTO substrates by chemical solution deposition
Comparative study on substitution effects in BiFeO3 thin films fabricated on FTO substrates by chemical solution deposition
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化学溶液沉积法在FTO基底上制备BiFeO3薄膜的替代效应比较研究
DOI：
10.1016/j.apsusc.2013.05.147
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发表时间：
2013-10
影响因子：
6.7
通讯作者：
Ren, Huijun
中科院分区：
文献类型：
--
作者：
Xue, Xu;Tan, Guoqiang;Hao, Hangfei;Ren, Huijun
采用化学溶液沉积技术在FTO衬底上成功地制备了纯BiFeO 3（BFO）、BiFe0.97Co0.03O3−δ（BFCO）和Bi0.90Gd0.10Fe0.97Co0.03O3−δ（BGFCO）薄膜。场发射扫描电子显微镜显示，BGFCO薄膜的表面形貌比其他两种薄膜更加致密和均匀。拉曼散射光谱和X射线衍射分析表明，Gd掺杂量为10%时，BFCO薄膜出现了四方相转变和（1 1 0）择优取向的薄膜织构。X射线光电子能谱（XPS）分析表明，Co掺杂导致BFCO薄膜中氧空位浓度增加，而Gd的进一步引入降低了BFCO薄膜中的氧空位浓度，且BFCO和BGFCO薄膜中的Fe 2+离子浓度低于BFO薄膜中的Fe 2+离子浓度。BFCO薄膜的反射极化（Pr）由BFO薄膜的1.4 μ C/cm 2提高到11.2 μC/cm 2。BGFCO薄膜的高击穿强度、高电场下的低漏电流密度、介电性能的改善以及Bi离子孤电子对的立体化学活性的增加共同贡献了室温下的巨大Prof 139.6 μC/cm 2。
Pure BiFeO3(BFO), BiFe0.97Co0.03O3−δ(BFCO) and Bi0.90Gd0.10Fe0.97Co0.03O3−δ(BGFCO) thin films were successfully deposited on FTO substrates by chemical solution deposition technique. The field emission scanning electron microscope reveals that the surface morphology of the BGFCO thin film becomes more compact and uniform than that of the other two films. A slight lattice distortion is created in the BFCO thin film, whereas 10% Gd doping gives rise to tetragonal phase transition and (1 1 0) preferentially oriented film texture for the BGFCO thin film, as evidenced by Raman scattering spectra and X-ray diffraction analyses. X-ray photoelectron spectroscopy analyses clarify that Co-doping results in the increase of oxygen vacancy concentration in the BFCO film, while further introduction of Gd into the BFCO lattice can decrease oxygen vacancy concentration, and the concentrations of Fe2+ions in the BFCO and BGFCO thin films are less than that in the BFO counterpart. The BFCO film shows the improved remanent polarization (Pr) of 11.2 μC/cm2compared with that of 1.4 μC/cm2for the BFO film. The high breakdown strength, low leakage current density in the high electric filed, improved dielectric properties as well as the increased stereochemical activity of Bi ion lone electron pair of the BGFCO thin film all together contribute to the giantProf 139.6 μC/cm2at room temperature.
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