窄带隙钴取代 BiFeO3 自旋涂层薄膜的杰出铁电特性

IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-07-29 DOI:10.1007/s10971-024-06443-4
Jing Zhang, Jian-Qing Dai, Guang-Cheng Zhang, Xin-Jian Zhu
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引用次数: 0

摘要

采用溶胶-凝胶法制备了 BiFe1-xCoxO3 (BFCO,x = 0-0.05)薄膜,并将其沉积在掺氟氧化锡(FTO)/玻璃基底上。研究了 BFCO 薄膜的晶体结构、表面形貌、介电性质、极化和光学特性。X 射线衍射 (XRD) 和拉曼光谱分析表明,钴掺杂会导致晶格畸变。扫描电子显微镜(SEM)图像表明,x = 0.03 的 BFCO 薄膜具有均匀的细晶粒,这对其铁电特性至关重要。从 XPS 图可以看出,掺入 Co 可以抑制 Fe3+ 向 Fe2+ 的转化,BiFe0.97Co0.03O3 薄膜的氧空位浓度大大降低。因此,BiFe0.97Co0.03O3 薄膜的漏电流密度(J = 7.18 × 10-7 A/cm2)最低。该薄膜在室温下具有出色的残余极化性能,Pr = 152.1 μC/cm2,是纯 BFO(Pr = 72.33 μC/cm2)的两倍多。此外,与纯 BFO 样品相比,BFCO 薄膜的介电性能有显著改善。这种改善归因于 Co 掺杂引起的结构转变,以及晶粒尺寸的减小和氧空位浓度的降低。此外,与 BFO 薄膜(Eg = 1.87 eV)相比,BiFe0.97Co0.03O3 薄膜的带隙更窄(Eg = 1.69 eV)。因此,可以扩大 BFO 薄膜的光伏应用范围。
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Outstanding ferroelectric properties in the narrow bandgap cobalt-substituted BiFeO3 spin-coated films

Thin films of BiFe1−xCoxO3 (BFCO, x = 0–0.05) were prepared using the sol–gel method and deposited on a fluorine-doped tin oxide (FTO)/glass substrate. The crystal structure, surface morphology, dielectric properties, polarization, and optical characteristics of the BFCO thin films were investigated. X-ray diffraction (XRD) and Raman spectroscopy analyses show that Co doping induces lattice distortion. Scanning electron microscopy (SEM) images demonstrate that BFCO films with x = 0.03 possess uniform fine grains, which are crucial for their ferroelectric properties. From XPS pattern, it can be observed that Co doping can inhibit the conversion of Fe3+ into Fe2+, and BiFe0.97Co0.03O3 films exhibit greatly reduced oxygen vacancy concentration. Therefore, BiFe0.97Co0.03O3 film was found to have the lowest leakage current density (J = 7.18 × 10−7 A/cm2). The film demonstrates outstanding residual polarization at room temperature, with a value of Pr = 152.1 μC/cm2, more than twice the magnitude of that in pure BFO (Pr = 72.33 μC/cm2). Moreover, the dielectric properties of BFCO films show a significant improvement when compared to those of pure BFO samples. This enhancement is attributed to the Co doping-induced structural transition, along with a reduction in grain size and a decrease in the concentration of oxygen vacancies. Additionally, the BiFe0.97Co0.03O3 film exhibits a narrower band gap (Eg = 1.69 eV) in comparison to the BFO film (Eg = 1.87 eV). Consequently, an expansion in the range of photovoltaic applications for BFO films can be achieved.

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来源期刊
Journal of Sol-Gel Science and Technology
Journal of Sol-Gel Science and Technology 工程技术-材料科学:硅酸盐
CiteScore
4.70
自引率
4.00%
发文量
280
审稿时长
2.1 months
期刊介绍: The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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