The SrBi4Ti4O15-based sandwich-structured films for energy storage capacitors

作者：Y. Zhang, Dongpo Song, Zhenzhen Hui, Yu Lei, Ruiyuan Li, Chonghua Pei, Jie Yang · 发表于：Journal of Applied Physics · 年份：2024 · DOI：10.1063/5.0233632 · 被引用次数：9 · 研究领域：Ferroelectric and Piezoelectric Materials、Multiferroics and related materials、Dielectric properties of ceramics

Both large spontaneous polarization and high breakdown strength are necessary to achieve high recoverable energy density in capacitors. Unfortunately, there is a trade-off between them within the homogeneous medium. Therefore, a sandwich structure with a high polarization layer was designed in the Aurivillius phase lead-free film to address this issue. This strategy can effectively enhance the polarization capability by introducing a highly spontaneous polarization layer and also improve the breakdown strength by reducing the leakage current caused by interfacial barriers and grain refinement. Benefiting from the synergistic effects, a high energy density of 50.4 J/cm3 with a high efficiency of 76.6% in the sandwich-structure thin film capacitors were achieved. In addition, the energy storage performance exhibits good wide frequency range and high-temperature stability. This approach is generally applicable to the design of other ferroelectrics and dielectrics promises high-performance energy storage capacitors.