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In the research field of energy storage dielectrics, the “responsivity” parameter, defined as the recyclable/recoverable energy density per unit electric field, has become critically important for a comprehensive evaluation of the energy storage capability of a dielectric. In this work, high recyclable energy density and responsivity, i.e., Wrec = 161.1 J·cm–3 and ξ = 373.8 J·(kV·m2)–1, have been simultaneously achieved in a prototype perovskite dielectric, BaTiO3, which is integrated on Si at 500 ℃ in the form of a submicron thick film. This ferroelectric film features a multi-scale polar structure consisting of ferroelectric grains with different orientations and inner-grain ferroelastic domains. A LaNiO3 buffer layer is used to induce a {001} textured, columnar nanograin microstructure, while an elevated deposition temperature promotes lateral growth of the nanograins (in-plane diameter increases from ~10–20 nm at lower temperatures to ~30 nm). These preferably oriented and periodically regulated nanograins have resulted in a small remnant polarization and a delayed polarization saturation in the film’s PE behavior, leading to a high recyclable energy density. Meanwhile, an improved polarizability/dielectric constant of the BaTiO3 film has produced a much larger maximum polarization than those deposited at lower temperatures at the same electric field, leading to a record-breaking responsivity for this simple perovskite.


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Simultaneously achieving high energy density and responsivity in submicron BaTiO3 film capacitors integrated on Si

Show Author's information Jun Ouyang1,2,3( )Yinxiu Xue1Chuanqi Song1Meiling Yuan3,4Kun Wang3,5Yuyao Zhao3Hongbo Cheng1,3Hanfei Zhu1,3Chao Liu1
Institute of Advanced Energy Materials and Chemistry, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Key Laboratory of Key Film Materials & Application for Equipment, School of Material Sciences and Engineering, Xiangtan University, Xiangtan 411105, China
School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Academic Affairs Office, Civil Aviation University of China, Tianjin 300300, China
China Tobacco Shandong Industrial Co., Ltd., Jinan 250014, China

Abstract

In the research field of energy storage dielectrics, the “responsivity” parameter, defined as the recyclable/recoverable energy density per unit electric field, has become critically important for a comprehensive evaluation of the energy storage capability of a dielectric. In this work, high recyclable energy density and responsivity, i.e., Wrec = 161.1 J·cm–3 and ξ = 373.8 J·(kV·m2)–1, have been simultaneously achieved in a prototype perovskite dielectric, BaTiO3, which is integrated on Si at 500 ℃ in the form of a submicron thick film. This ferroelectric film features a multi-scale polar structure consisting of ferroelectric grains with different orientations and inner-grain ferroelastic domains. A LaNiO3 buffer layer is used to induce a {001} textured, columnar nanograin microstructure, while an elevated deposition temperature promotes lateral growth of the nanograins (in-plane diameter increases from ~10–20 nm at lower temperatures to ~30 nm). These preferably oriented and periodically regulated nanograins have resulted in a small remnant polarization and a delayed polarization saturation in the film’s PE behavior, leading to a high recyclable energy density. Meanwhile, an improved polarizability/dielectric constant of the BaTiO3 film has produced a much larger maximum polarization than those deposited at lower temperatures at the same electric field, leading to a record-breaking responsivity for this simple perovskite.

Keywords: energy density, energy storage, BaTiO3, Si, responsivity, dielectric capacitor

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Received: 25 October 2023
Revised: 02 December 2023
Accepted: 12 December 2023
Published: 08 March 2024
Issue date: February 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

The authors are deeply grateful for the financial support from the National Natural Science Foundation of China (Grant Nos. 51772175 and 52002192), Natural Science Foundation of Shandong Province (Grant Nos. ZR2022ZD39, ZR2022ME075, ZR2020QE042, ZR2022ME031, and ZR2022QB138), and the Science, Education and Industry Integration Pilot Projects of Qilu University of Technology (Shandong Academy of Sciences) (Grant Nos. 2022GH018 and 2022PY055). Jun Ouyang acknowledges the support from the Jinan City Science and Technology Bureau (Grant No. 2021GXRC055), and the Education Department of Hunan Province/Xiangtan University (Grant No. KZ0807969), as well as the seed funding for top talents at Qilu University of Technology (Shandong Academy of Sciences).

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