Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/abfa75
Keywords
HfO2; ZrO2; ferroelectric; nanolaminate; phase transformation
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Funding
- JST CREST [JPMJCR14F2]
- JST Japan-Taiwan Collaboration Research Program [JPMJKB1903]
- JSPS KAKENHI [20H2445]
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Comparison was made between the ferroelectric phase transformation of Hf0.5Zr0.5O2 solid solution films and HfO2/ZrO2 nanolaminate films. The results showed that nanolaminate structures remained robust even after high-temperature annealing, and exhibited better ferroelectric performance.
Ferroelectric phase transformation was compared between the Hf0.5Zr0.5O2 solid solution films and the HfO2/ZrO2 nanolaminate films, prepared by sputter deposition without heat treatment and crystallized by following cap annealing. Physical analyses showed that nanolaminate structures and their interfaces were robust even after high-temperature annealing. Ferroelectricity appeared largely in the nanolaminate films than in the solid solution film, and the best performance was attained in the nanolaminate film with the cycle thickness of monolayer oxide (0.25 nm). Long period annealing cleared that the ferroelectric phase transformation is greatly accelerated in the nanolaminate films than in the solid solution films.
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