1. Optimized energy storage performances in morphotropic phase boundary (Na0.8K0.2)0.5Bi0.5TiO3-based lead-free ferroelectric thin films
- Author
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Jinjun Liu, Yiling Zhang, Zhongbin Pan, Zhen Su, Yizan Zhai, Jie Ding, and Jianwen Chen
- Subjects
Phase boundary ,Materials science ,business.industry ,Process Chemistry and Technology ,Ferroelectricity ,Piezoelectricity ,Energy storage ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Capacitor ,law ,Materials Chemistry ,Ceramics and Composites ,Optoelectronics ,Microelectronics ,Thin film ,Polarization (electrochemistry) ,business - Abstract
As microelectronic devices move toward integration and miniaturization, the thin film capacitors with high energy density and charge/discharge efficiency have attracted immense interests in modern electrical energy storage systems. Despite morphotropic phase boundary (Na0.8K0.2)0.5Bi0.5TiO3-based lead-free materials with outstanding ferroelectric and piezoelectric properties, while large ferroelectric hysteresis with high remanent polarization (Pr) hinder to improve energy storage capability. Here, novel lead-free relaxor-ferroelectric (RFE) thin film capacitors with high energy density are successfully prepared in (1-x) (Na0.8K0.2)0.5Bi0.5TiO3-xBa0.3Sr0.7TiO3 [(1-x)NKBT-xBST] systems. Introducing BST into the NKBT systems is expected to reduce remanent polarization (Pr) on account of coupling reestablishment of the polar nano-regions (PNRs) and improving the relaxation behavior. As a result, 0.6NKBT-0.4BST thin film exhibits high energy density (Wrec ∼ 54.79 J/cm3) together with satisfactory efficiency (η ∼ 76.42%) at 3846 kV/cm. The stable energy storage performances are achieved within the scope of operating temperatures (20–200 °C) and fatigue cycles (1-107 cycles). This work furnishes a new technological way for the design of high energy-density thin film capacitors.
- Published
- 2022
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