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Harnessing Phase Transitions in Antiferroelectric ZrO2 Using the Size Effect
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-10-07 , DOI: 10.1002/aelm.202100556 Patrick D. Lomenzo 1 , Monica Materano 1 , Terence Mittmann 1 , Pratyush Buragohain 2 , Alexei Gruverman 2 , Takanori Kiguchi 3 , Thomas Mikolajick 1 , Uwe Schroeder 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-10-07 , DOI: 10.1002/aelm.202100556 Patrick D. Lomenzo 1 , Monica Materano 1 , Terence Mittmann 1 , Pratyush Buragohain 2 , Alexei Gruverman 2 , Takanori Kiguchi 3 , Thomas Mikolajick 1 , Uwe Schroeder 1
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The unique nonlinear dielectric properties of antiferroelectric (AFE) oxides are promising for advancements in solid state supercapacitor, actuator, and memory technologies. AFE behavior in high-k ZrO2 is of particular technological interest, but the origin of antiferroelectricity in ZrO2 remains questionable. The theory of reversible electric field-induced phase transitions between the nonpolar P42/nmc tetragonal phase and the polar Pca21 orthorhombic phase is experimentally tested with local structural and electromechanical characterization of AFE ZrO2 thin films. Piezoresponse force microscopy identifies signature evidence of a field-induced phase transition. A significant size effect in AFE ZrO2 is experimentally observed as film thickness is scaled down from 14.7 to 4.3 nm. The size effect is explained by modifications to the phase transition energy barrier heights ranging from 0.6 to 7.6 meV f.u−1 depending on crystallite size and in-plane compressive strain with decreasing ZrO2 film thickness. Using the size effect, it is possible to double the energy storage density in ZrO2 from 20 J cm−3 to greater than 40 J cm−3, thus highlighting a feasible route for superior performance in AFE fluorite supercapacitors.
中文翻译：
利用尺寸效应利用反铁电 ZrO2 中的相变
反铁电 (AFE) 氧化物独特的非线性介电特性有望推动固态超级电容器、致动器和存储器技术的进步。高 k ZrO 2中的AFE 行为具有特别的技术意义，但 ZrO 2中反铁电性的起源仍然值得怀疑。用 AFE ZrO 2 的局部结构和机电特性对非极性 P4 2 /nmc 四方相和极性Pca 2 1正交相之间的可逆电场诱导相变理论进行了实验测试薄膜。压电响应力显微镜识别场诱导相变的特征证据。随着薄膜厚度从 14.7 缩小到 4.3 nm，实验观察到AFE ZrO 2 中的显着尺寸效应。尺寸效应通过改变相变能垒高度来解释，范围从0.6到7.6 meV fu -1取决于微晶尺寸和随着ZrO 2膜厚度减小的面内压缩应变。利用尺寸效应，可以将 ZrO 2 中的能量存储密度从 20 J cm -3提高一倍至大于 40 J cm -3，从而突出了在 AFE 萤石超级电容器中实现卓越性能的可行途径。
更新日期：2021-10-07
中文翻译：
利用尺寸效应利用反铁电 ZrO2 中的相变
反铁电 (AFE) 氧化物独特的非线性介电特性有望推动固态超级电容器、致动器和存储器技术的进步。高 k ZrO 2中的AFE 行为具有特别的技术意义，但 ZrO 2中反铁电性的起源仍然值得怀疑。用 AFE ZrO 2 的局部结构和机电特性对非极性 P4 2 /nmc 四方相和极性Pca 2 1正交相之间的可逆电场诱导相变理论进行了实验测试薄膜。压电响应力显微镜识别场诱导相变的特征证据。随着薄膜厚度从 14.7 缩小到 4.3 nm，实验观察到AFE ZrO 2 中的显着尺寸效应。尺寸效应通过改变相变能垒高度来解释，范围从0.6到7.6 meV fu -1取决于微晶尺寸和随着ZrO 2膜厚度减小的面内压缩应变。利用尺寸效应，可以将 ZrO 2 中的能量存储密度从 20 J cm -3提高一倍至大于 40 J cm -3，从而突出了在 AFE 萤石超级电容器中实现卓越性能的可行途径。
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