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arXiv · 2503.13027

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

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

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/cm$^3$ 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.

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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. 2025-03-17. Giant energy density nitride dielectrics enabled by a paraelectric-metaparaelectric phase transition. https://arxiv.org/abs/2503.13027

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