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Comparative Performance of Fluorite-Structured Materials for Nanosupercapacitor Applications

Published 15 May 2024 in physics.app-ph and cond-mat.mtrl-sci | (2405.09345v1)

Abstract: Over the last fifteen years, ferroelectric and antiferroelectric ultra thin films based on fluorite-structured materials have drawn significant attention for a wide variety of applications requiring high integration density. Antiferroelectric $ZrO_2$, in particular, holds significant promise for nanosupercapacitors, owing to its potential for high energy storage density (ESD) and high efficiency ($\eta$). This work assesses the potential of high-performance $Hf_{1-x}Zr_{x}O_2$ thin films encapsulated by TiN electrodes that show linear dielectric (LD), ferroelectric (FE), and antiferroelectric (AFE) behavior. Oxides on silicon are grown by magnetron sputtering and plasma-enhanced atomic layer deposition. ESD and $\eta$ are compared for FE, AFE, and LD samples at the same electrical field (3.5 MV/cm). As expected, ESD is higher for the FE sample ($95 J/cm3$), but $\eta$ is ridiculously small ($\approx$ 55%), because of the opening of the FE hysteresis curve inducing high loss. Conversely, LD samples exhibit the highest efficiency (nearly 100%), at the expense of a lower ESD. AFE $ZrO_2$ thin film strikes a balance between FE and LD behavior, showing reduced losses compared to the FE sample but an ESD as high as $52 J/cm3$ at 3.5 MV/cm. This value can be further increased up to $84 J/cm3$ at a higher electrical field (4.0 MV/cm), with an $\eta$ of 75%, among the highest values reported for fluorite-structured materials, offering promising perspectives for future optimization.

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