Ultralow operating voltage for energy conversion performance in Hf1–xZrxO2 thin films
Emerging ferroelectric and antiferroelectric HfO2-based thin films are attractive candidates for energy conversion and storage applications. In this work, the polar phase transformation between tetragonal and orthorhombic phases associated with ferroelectric or antiferroelectric behaviors is utilize...
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Published in | Journal of Materiomics Vol. 10; no. 6; pp. 1206 - 1213 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.2024
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Emerging ferroelectric and antiferroelectric HfO2-based thin films are attractive candidates for energy conversion and storage applications. In this work, the polar phase transformation between tetragonal and orthorhombic phases associated with ferroelectric or antiferroelectric behaviors is utilized to manipulate the electrocaloric cooling and energy storage performances in Zr-doped, woken up HfO2 ultrathin films. A giant electrocaloric temperature change of up to 11.85 K in Hf0.5Zr0.5O2 with the morphotropic phase boundary (MPB) state and a high energy storage density of 39.34 J/cm3 in the tetragonal phase-dominant Hf0.25Zr0.75O2 system are obtained. More interestingly, contrary to overdoping and excessive electric fields, an appropriate Zr concentration of 0.5 and an applicable driving field of 1.91 MV/cm are desired for the electrocaloric effect, resulting in an ultralow operating voltage as low as 1.3 V in this 6.8 nm thick Hf0.5Zr0.5O2 film. These findings illustrate that the structural design strategy is a visible method for achieving optimal energy-related behaviors and highlight the great possibilities for building future energy-related devices.
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•A giant electrocaloric response of 11.85 K accompanied with a wide temperature span (303–327 K for |ΔT| > 10 K) is achieved.•An ultralow operating voltage of 1.3 V is adequate for generating a high electrocaloric effect in the Hf0.5Zr0.5O2 thin film.•A high energy storage density of 39.34 J/cm3 is obtained in the Hf0.25Zr0.75O2 capacitor. |
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ISSN: | 2352-8478 |
DOI: | 10.1016/j.jmat.2024.01.001 |