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Capturing Carriers and Driving Depolarization by Defect Engineering for Dielectric Energy Storage.

Yueshun Zhao1, Bo Yang1, Yaping Liu1

  • 1Inner Mongolia Key Lab of Nanoscience and Nanotechnology, Inner Mongolia University, Hohhot 010021, PR China.

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|January 26, 2022
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Summary

Defect engineering in Sr2Bi4Ti(5-Fe)O18 films uses oxygen vacancies to enhance dielectric energy storage. This approach boosts breakdown strength and energy density by controlling defect dipoles, overcoming traditional limitations.

Keywords:
capturingdefect dipolesdefect engineeringdriving fieldenergy storage

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Dielectric Materials

Background:

  • Defect carriers in dielectric capacitors typically reduce polarization and breakdown strength, hindering energy storage performance.
  • Traditional approaches focus on minimizing defects, but this study explores defect engineering for improved functionality.

Purpose of the Study:

  • To design and investigate (FeTi' - Vo••)• and (FeTi″ - Vo••) defect dipoles in Sr2Bi4Ti(5-Fe)O18 layered perovskite films.
  • To explore the role of oxygen vacancy defect engineering in enhancing dielectric energy storage properties.

Main Methods:

  • Fabrication of acceptor-doped Sr2Bi4Ti(5-Fe)O18 layered perovskite films with engineered oxygen vacancies.
  • Characterization of defect structures, including defect dipoles and their impact on electrical properties.
  • Analysis of electron capture by oxygen vacancies and the influence of defect dipoles on polarization and breakdown strength.

Main Results:

  • Oxygen vacancies effectively capture electrons, enhancing breakdown strength in n-type dielectrics.
  • Engineered defect dipoles facilitate depolarization, lowering residual polarization without compromising maximum polarization.
  • The Sr2Bi4Ti4.92Fe0.08O18 film achieved a high energy density of 110.5 J/cm³ and 70.0% efficiency at 3915 kV/cm.

Conclusions:

  • Defect engineering provides an alternative strategy to overcome the trade-off between polarization and breakdown strength in dielectric energy storage.
  • Controlled oxygen vacancy concentration is crucial for optimizing energy storage performance in these perovskite films.
  • This work demonstrates a novel pathway for enhancing dielectric energy storage through targeted defect manipulation.