材料科学
电介质
响应度
铁电性
拉尼奥
极化(电化学)
钽酸盐
光电子学
电场
介电常数
凝聚态物理
光电探测器
量子力学
物理
物理化学
化学
作者
Jun Ouyang,Yinxiu Xue,Chao Song,Miao Yuan,Kun Wang,Yuchen Zhao,Hongbo Cheng,Hanfei Zhu,C. H. Liu
标识
DOI:10.26599/jac.2024.9220841
摘要
In the research field of energy storage dielectrics, the “responsivity” parameter, defined as the recyclable/recoverable energy density per unit electric field, has become critically important for a comprehensive evaluation of the energy storage capability of a dielectric. In this work, a high recyclable energy density and responsivity, i.e., Wrec=161.1 J cm-3 and x=373.8 J (kV×m2) -1, have been simultaneously achieved in a prototype perovskite dielectric, BaTiO3, which is integrated on Si at 500°C in the form of a submicron thick film. This ferroelectric film features a multi-scale polar structure consisting of ferroelectric grains with different orientations and inner-grain ferroelastic domains. A LaNiO3 buffer layer is used to induce a {001} textured, columnar nanograin microstructure, while an elevated deposition temperature promotes lateral growth of the nanograins (in-plane diameter increases from ~ 10-20 nm at lower temperatures to ~ 30 nm). These preferably oriented and periodically regulated nanograins have resulted in a small remnant polarization and a delayed polarization saturation in the film’s P-E behavior, leading to a high recyclable energy density. Meanwhile, an improved polarizability/dielectric constant of the BaTiO3 film has produced a much larger maximum polarization than those deposited at lower temperatures at the same electric field, leading to a record-breaking responsivity for this simple perovskite.
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