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<p>Electrostatic dielectric capacitors are foundational to advance the electronics and electric power devices due to their ultrafast charging/discharging capability and high-power density. However, the low energy density limits the potential for next generation devices in terms of miniaturization and integration. We propose a strategy that relies on inducing a field-driven phase transition that we denote paraelectric-metaparaelectric, which yields an ultrahigh energy density in III-nitrides. III-nitride compounds (Al, Sc, B)N with certain cation concentrations possess a nonpolar hexagonal ground phase which could transform into a polar wurtzite phase under a very large electric field, which is denoted as metaparaelectric with nearly null hysteresis <i>P-E</i> loop. This paraelectric-metaparaelectric transition leads to a polarization saturation at large electric field. The corresponding <i>P-E</i> loop displays a giant energy density of 308 J/cm<sup>3</sup> with high efficiency nearly 100%. The proposed paraelectric-metaparaelectric phase transition strategy in nitrides opens an avenue to design of next generation high performance dielectrics.</p>

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Giant energy density nitride dielectrics enabled by a paraelectric-metaparaelectric phase transition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月3日

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  • Zhijie Liu,
  • Xingyue Ma,
  • Lan Chen,
  • Xiaohong Yan,
  • Jun-Ming Liu,
  • Chun-Gang Duan,
  • Jorge Íñiguez-González,
  • Di Wu,
  • Yurong Yang

摘要

Electrostatic dielectric capacitors are foundational to advance the electronics and electric power devices due to their ultrafast charging/discharging capability and high-power density. However, the low energy density limits the potential for next generation devices in terms of miniaturization and integration. We propose a strategy that relies on inducing a field-driven phase transition that we denote paraelectric-metaparaelectric, which yields an ultrahigh energy density in III-nitrides. III-nitride compounds (Al, Sc, B)N with certain cation concentrations possess a nonpolar hexagonal ground phase which could transform into a polar wurtzite phase under a very large electric field, which is denoted as metaparaelectric with nearly null hysteresis P-E loop. This paraelectric-metaparaelectric transition leads to a polarization saturation at large electric field. The corresponding P-E loop displays a giant energy density of 308 J/cm3 with high efficiency nearly 100%. The proposed paraelectric-metaparaelectric phase transition strategy in nitrides opens an avenue to design of next generation high performance dielectrics.