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논문 기본 정보

자료유형
학술저널
저자정보
Cüppers Felix (Department of Materials Science and Engineering Tokyo Institute of Technology) Hirai Koji (Department of Materials Science and Engineering Tokyo Institute of Technology) Funakubo Hiroshi (Department of Materials Science and Engineering Tokyo Institute of Technology)
저널정보
나노기술연구협의회 Nano Convergence Nano Convergence Vol.9 No.56
발행연도
2022.12
수록면
1 - 9 (9page)
DOI
10.1186/s40580-022-00344-4

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초록· 키워드

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Epitaxial layers of ferroelectric orthorhombic HfO2 are frequently investigated as model systems for industrially more relevant polycrystalline films. The recent success in stabilizing the orthorhombic phase in the solid-solution cerium oxide – hafnium oxide system allows detailed investigations of external influences during fabrication. This report analyzes the ferroelectric properties of two thin film capacitors, which were post-deposition annealed in N2 and O2 atmospheres to achieve the orthorhombic phase after room temperature deposition. The samples, which exhibit very similar constituent phase, appear identical in conventional polarization-field hysteresis measurements. However, a significant switching speed difference is observed in pristine devices. Continued field cycling reduces the difference. Deeper analysis of switching transients based on the Nucleation Limited Switching model suggests that the O2 heat treatment atmosphere results in an altered oxygen vacancy profile, which is reverted during ferroelectric cycling.

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