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Optimization of energy-storage performance of Mn-doped BaZr0.2Ti0.8O3 lead-free ferroelectric thin films by the sol–gel method

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
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Abstract

Dielectric capacitors have been widely studied for energy storage applications in pulsed power electronic and electrical systems due to their fast charge/discharge rate and high power density. In this work, the lead-free ferroelectric BaZr0.2Ti0.8O3–0.02 MnO2 (BZT-0.02 Mn) thin films are prepared by a sol–gel method on Pt(111)/Ti/SiO2/Si(100) substrates. The crystal structure, surface morphology, ferroelectric properties, leakage behavior, energy storage properties and stability of the films are systematically investigated. The BZT-0.02 Mn thin films exhibit relatively high recoverable energy storage density of 32.3 J/cm3 and energy storage efficiency of 62% at 3700 kV/cm. In addition, the frequency-insensitive stability from 0.1 kHz to 10 kHz, long-term fatigue resistance up to 107 switching cycles and high temperature stability in a range of 20 °C to 120 °C are also achieved. The results show that the BZT-0.02 Mn thin film is a promising lead-free dielectrics for application in energy storage.

Graphical Abstract

Schematic diagram and energy storage characteristics of BaZr0.2Ti0.8O3–0.02 MnO2 thin film capacitor.

Highlights

  • Ba0.2Zr0.8TiO3 thin films doped with 2 mol% MnO2 are prepared on Pt(111)/Ti/SiO2/Si(100) substrates by the sol–gel method.

  • An improved high energy storage density of 32.3 J/cm3 and an optimized high energy storage efficiency of 62% are achieved in the Ba0.2Zr0.8TiO3–MnO2 thin film.

  • Excellent frequency stability, temperature stability and fatigue resistance are also obtained in the Ba0.2Zr0.8TiO3–MnO2 thin film.

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Acknowledgements

This work was supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, and National Natural Science Foundation of China (NSFC) under grant No. 51902155.

Author contributions

Yutao Luo: Formal analysis, investigation, writing – original draft. Guoxiu Qiu: Investigation, formal analysis, validation, writing – original draft. Jun Wang: Conceptualization, writing –review & editing. Yunfei Liu: Project administration, conceptualization, supervision, funding acquisition. Jin Luo: Conceptualization, writing –review & editing, funding acquisition, supervision. Yinong Lyu: Conceptualization, supervision, project administration.

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Authors and Affiliations

  1. The State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China

    Yutao Luo, Guoxiu Qiu, Jun Wang, Yunfei Liu, Jin Luo & Yinong Lyu

  2. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 210009, China

    Yutao Luo, Guoxiu Qiu, Jun Wang, Yunfei Liu, Jin Luo & Yinong Lyu

  3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing, 210009, China

    Yutao Luo, Guoxiu Qiu, Jun Wang, Yunfei Liu, Jin Luo & Yinong Lyu

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  1. Yutao Luo
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  2. Guoxiu Qiu
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Luo, Y., Qiu, G., Wang, J. et al. Optimization of energy-storage performance of Mn-doped BaZr0.2Ti0.8O3 lead-free ferroelectric thin films by the sol–gel method. J Sol-Gel Sci Technol 107, 560–568 (2023). https://doi.org/10.1007/s10971-023-06150-6

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  • DOI: https://doi.org/10.1007/s10971-023-06150-6

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