Effect of substrates on the structure and optical properties of polycrystalline BiFeO₃ thin films

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• 作者：Ling Chen^a ; ^{lingchen@cug.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhen-Zhu Wan^a ; Qing-Bo Wang^a ; Wei Ren^b ; Zuo-guang Ye^b ; Mei Quan^a ; Gang He^c ; ^{gh6321@139.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Thin films ; Sol&ndash ; gel preparation ; Optical materials and properties
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：127
• 期：2
• 页码：585-587
• 全文大小：966 K

文摘

Multiferroic BiFeO₃ thin films were prepared on Pt/TiO₂/SiO₂/Si and ITO/glass substrates by sol–gel preparation method. Pure perovskite phase and uniform surface topography have been verified by X-ray diffraction and atomic force microscopy, respectively. In addition, optical property measured by spectroscopic ellipsometer indicated that the absorptivity of both BiFeO₃ thin films was enhanced with increasing photo energy after an illumination among 250–1000 nm. Tauc calculation indicated that the direct band gap was 2.92 eV for the film on Pt/TiO₂/SiO₂/Si, which is about 0.4 eV lower than that of the film on ITO/glass.