Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 6, Pages 7720-7727Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.11.115
Keywords
Relaxor ferroelectrics; Composite films; Dielectric properties; Energy storage
Categories
Funding
- National Natural Science Foundation of China [91833303, 61974043, 61674057]
- National Key Research and Development Program of China [2018YFB0406500, 2017YFA0303403, 2019YFB2203400]
- Projects of Science and Technology Commission of Shanghai Municipality [18JC1412400, 18YF1407200, 18YF1407000, 19511120100]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
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The study demonstrated that by introducing ultrathin Al2O3 insulating intercalations into Ba(Zr0.2Ti0.8)O-3 (BZT) relaxor ferroelectric films, the electrical performance of the dielectric can be improved, leading to reduced leakage current and enhanced voltage endurance capability. This significantly enhances the energy storage density and efficiency of electrostatic energy storage capacitors.
Ultrathin Al2O3 insulating intercalations with different thicknesses and numbers, prepared by atomic layer deposition technology, were introduced into Ba(Zr0.2Ti0.8)O-3 (BZT) relaxor ferroelectric films as the dielectric for electrostatic energy storage capacitors. The phase structure, microstructure and electrical properties were investigated in detail. Due to the insertion of insulating layers, the films show less leakage current and enhanced voltage endurance capability when the thickness of single Al2O3 intercalation exceeds a threshold (0.45-0.9 nm). The voltage endurance capability can be more enhanced by increasing the number of Al2O3 intercalations. For energy storage applications, the energy storage density and efficiency obtained from the polarization-electric field loops are significantly improved owing to the suppressed leakage and enhanced voltage endurance ability. The results promote the application of BZT-based films in electrostatic energy storage. It is demonstrated that the introduction of atomic-layer-deposited insulating intercalations with controllable thickness, such as those fabricated by ALD method, is an effective way to improve the electrical performance of devices based on composite materials.
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