Impact of Ca doping on energy storage efficiency and ferroelectric properties in BiFeO3 thin films

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-05-06 DOI:10.1016/j.jallcom.2025.180819

Yoonho Ahn , Jong Yeog Son

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Abstract

The development of lead-free ferroelectric thin films for energy storage applications has gained significant attention due to the demand for environmentally sustainable, high-efficiency capacitors. This study explores the ferroelectric and energy storage properties of Ca-doped BiFeO₃ (BFO) thin films fabricated by pulsed laser deposition, with Ca concentrations of 0, 10, 20, 30, and 40 mol%. Structural analysis revealed that grain size and crystallinity improved with increasing Ca content up to 30 mol%. The remanent polarization initially increased, peaking at 10 mol% Ca, and then gradually decreased due to the competing effects of enhanced crystallinity and lattice contraction. The optimized 30 mol% Ca-doped BFO thin film exhibited the highest recoverable energy density of 56.6 J/cm³ and an energy storage efficiency of 60.1 %, attributed to reduced leakage current, increased saturation polarization, and lower remanent polarization. Ca doping effectively suppressed oxygen vacancies, contributing to improved leakage current behavior and excellent fatigue endurance up to 10¹² cycles. These findings demonstrate that Ca doping serves as an effective strategy for tuning the energy storage performance of BFO thin films, offering promising potential for high-efficiency, lead-free ferroelectric capacitors.

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Ca掺杂对BiFeO3薄膜储能效率和铁电性能的影响

由于对环境可持续、高效电容器的需求，用于储能应用的无铅铁电薄膜的发展受到了极大的关注。本研究探讨了脉冲激光沉积制备的掺钙BiFeO3 （BFO）薄膜的铁电性能和储能性能，Ca浓度分别为0、10、20、30和40 mol%。结构分析表明，钙含量增加至30 mol%时，晶粒尺寸和结晶度有所改善。剩余极化开始增加，在10 mol% Ca时达到峰值，然后由于结晶度增强和晶格收缩的相互作用而逐渐降低。优化后的30 mol%掺钙BFO薄膜的可回收能量密度为56.6 J/cm³，储能效率为60.1%，这主要归功于泄漏电流的减小、饱和极化的增加和剩余极化的降低。Ca掺杂有效地抑制了氧空位，有助于改善泄漏电流行为，并具有高达1012次循环的优异疲劳耐久性。这些发现表明，Ca掺杂是调整BFO薄膜储能性能的有效策略，为高效无铅铁电电容器提供了广阔的前景。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.