Abstract SrTiO3-based films doped with different Al-precursors were prepared by sol-gel methods and the dielectric strengths and leakage currents of the materials were investigated. The best performance was found in SrTiO3 films doped with Al2O3 nanoparticles (nano-Al2O3). When 5 mol% of nano-Al2O3 was added to SrTiO3 films with Al electrodes, the dielectric strength was enhanced to 506.9 MV/m compared with a value of 233.5 MV/m for SrTiO3 films. The energy density of the 5 mol% nano-Al2O3 doped SrTiO3 films was 19.3 J/cm3, which was also far higher than that of the SrTiO3 films (3.2 J/cm3). These results were attributed to interfacial anodic oxidation reactions, which were experimentally confirmed by cross-sectional transmission electron microscope studies and theoretically modelled based on Faraday's laws. The films with added nano-Al2O3 featured many conducting paths at the interfaces between the host phase and the guest nano-Al2O3, which promoted ion transport and contributed to the strong anodic oxidation reaction capability of the 5 mol% nano-Al2O3 doped SrTiO3 films.

中文翻译：

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SrTiO 3 基纳米复合薄膜中能量密度增强的界面起源

摘要 采用溶胶-凝胶法制备了掺杂不同Al前驱体的SrTiO3基薄膜，并研究了材料的介电强度和漏电流。在掺杂有 Al2O3 纳米颗粒（纳米 Al2O3）的 SrTiO3 薄膜中发现了最佳性能。当将 5 mol% 的纳米 Al2O3 添加到带有 Al 电极的 SrTiO3 薄膜中时，介电强度提高到 506.9 MV/m，而 SrTiO3 薄膜的介电强度为 233.5 MV/m。5 mol%纳米Al2O3掺杂的SrTiO3薄膜的能量密度为19.3 J/cm3，也远高于SrTiO3薄膜的能量密度（3.2 J/cm3）。这些结果归因于界面阳极氧化反应，这通过横截面透射电子显微镜研究得到了实验证实，并基于法拉第定律进行了理论建模。