Ultrahigh energy storage density in epitaxial AlN/ScN superlattices,Physical Review Materials

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Ultrahigh energy storage density in epitaxial AlN/ScN superlattices
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-08 , DOI: 10.1103/physrevmaterials.5.l072401
Zhijun Jiang _{1,

2,

3} , Bin Xu ₄ , Hongjun Xiang _{2,

5,

6} , L. Bellaiche ₃

Affiliation

Dielectric and antiferroelectric materials are particularly promising for high-power energy storage applications. However, relatively low energy density greatly hinders their usage in storage technologies. Here, we report first-principles-based calculations predicting that epitaxial and initially nonpolar AlN/ScN superlattices can achieve an ultrahigh energy density of up to

200 J / {cm}^{3}

, accompanied by an ideal efficiency of 100%. We also show that high energy density requires that the system be neither too close nor too far from a ferroelectric phase transition under zero electric field. A phenomenological model is further proposed to rationalize such striking features.

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