First-Principles Perspective on Poling Mechanisms and Ferroelectric/Antiferroelectric Behavior of Hf1 -x Zrx O2 for FEFET Applications
2018 IEEE International Electron Devices Meeting (IEDM)(2018)
摘要
We investigate at the atomic level the most probable phase transformations under strain, that are responsible for the ferroelectric/antiferroelectric behavior in Hf
1-x
Zr
x
O
2
materials. Four different crystalline phase transformations exhibit a polar/non-polar transition: monoclinic-to-orthorhombic requires a gliding strain tensor, orthorhombic-to-orthorhombic transformation does not need strain to polarize the material, whereas tetragonal-to-cubic cell compression and tetragonal-to-orthorhombic cell elongation destabilizes the non-polar tetragonal phase, facilitating the transition towards a polar atomic configuration, therefore changing the polarization-electric field loop from antiferroelectric to ferroelectric. Oxygen vacancies can reduce drastically the polarization reversal barriers.
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关键词
gliding strain tensor,nonpolar tetragonal phase,polar atomic configuration,polarization-electric field loop,polarization reversal barriers,poling mechanisms,crystalline phase transformations,polar-nonpolar transition,monoclinic-orthorhombic phase transformation,first-principles calculation,tetragonal-orthorhombic cell elongation,orthorhombic-orthorhombic transformation,ferroelectric-antiferroelectric behavior,oxygen vacancies,Hf1-xZrxO2
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