Synergically improved energy storage performance and stability in sol–gel processed BaTiO 3 /(Pb,La,Ca)TiO 3 /BaTiO 3 tri-layer films with a crystalline engineered sandwich structure

作者：Jinpeng Liu, Ying Wang, Hanfei Zhu, Hong Luo, Xiao Zhai, Yu Huan, Jing Yan, Kun Wang, C. H. Liu, Hongbo Cheng, Jun Ouyang · 发表于：Journal of Advanced Ceramics · 年份：2023 · DOI：10.26599/jac.2023.9220821 · 被引用次数：25 · 研究领域：Ferroelectric and Piezoelectric Materials、Dielectric materials and actuators、Conducting polymers and applications

Achieving an excellent energy storage performance, together with a high cycling reliability, is desirable for expanding the technological applications of ferroelectric dielectrics. However, in a well-crystallized ferroelectric material, the concomitant high polarizability and low polarization-saturation field have led to a square-shaped polarization-electric field loop, fatally impairing both recoverable energy density ( W rec ) and efficiency ( η ). Nanocrystalline ferroelectric films with a macroscopically amorphous structure have shown an improved W rec and η , but their much-lower polarizability demands an extremely high electric field to achieve such performances, which is undesirable from economical viewpoints. Here, we propose a strategy to boost the energy storage performances and stabilities of ferroelectric capacitors simultaneously by constructing a tri-layer film in which a well-crystallized ferroelectric layer was sandwiched by two pseudo-linear dielectric layers with a dominant amorphous structure. In sol-gel-derived BaTiO 3 /(Pb,La,Ca)TiO 3 /BaTiO 3 (BTO/PLCT/BTO) tri-layer films, we show that the above design is realized via a rapid thermal annealing which fully crystallized the middle PLCT layer while left the top/bottom BTO cap layers in a poor crystallization status. This sandwiched structure is endowed with an enhanced maximum polarization while a small remnant one, and a much-delayed polarization saturation, which corresponds to a large W rec ~80 ...