溶胶-凝胶法制备掺铁钛酸铋铁电薄膜光学性能的研究

通过溶胶-凝胶法制备了不同掺杂浓度的Fe-BTO铁电薄膜以减小其光学带隙,研究不同Fe掺杂浓度对BTO铁电薄膜铁电光伏效应的影响。结果表明,使用溶胶-凝胶法对BTO铁电薄膜掺杂不同浓度的Fe,所制备的薄膜结晶度较好、网状结构明显、空间分布均匀,晶粒大小均一;通过溶胶-凝胶法制备Fe-BTO铁电薄膜在Fe掺杂浓度x=0.9附近可以明显减小其禁带宽度。

Optical Properties of Iron-doped Bismuth TitanateSynthesized by Sol-gol Process

Photon-generated carrier of ferroelectric photovoltaic effect is different from the carrier of traditional photovoltaic effect, which makes the ferroelectric photovoltaic effect much more excellent. It is of great significance to improve the photoelectric conversion efficiency, and overcome the shortcoming of large band gap of ferroelectric thin film, which has been an important subject of research in ferroelectric photovoltaic effect. In this work, BTO ferroelectric thin films with different doping concentration of Fe were prepared by sol-gel method to reduce the optical band gap. In order to study impact of different Fe doping concentration on photovoltaic effect of ferroelectric thin film, the film composition, microstructure, band gap and other factors were characterized. Research result shows that the doped Fe with concentration of (Bi4Ti3-xFexO12) changing from x = 0.8 to x = 1.2 does not transform the matrix structure of BTO; The doped film has good crystallinity, obvious reticular structure, well-proportioned spatial distribution and uniform grain size. The Fe-BTO ferroelectric thin films prepared by sol-gel method can significantly tune its band gap.