A comprehensive study on the mechanism of ferroelectric phase formation in hafnia-zirconia nanolaminates and superlattices

Title
A comprehensive study on the mechanism of ferroelectric phase formation in hafnia-zirconia nanolaminates and superlattices
Authors
최정혜장혜정이광엽Min Hyuk ParkHan Joon KimJaehong ParkYoung Hwan LeeYu Jin KimTaehwan MoonKeum Do KimSeung Dam HyunHyun Woo ParkCheol Seong Hwang
Keywords
ferroelectrics; nanolaminates; hafnia; zirconia; phase transition
Issue Date
2019-11
Publisher
Applied Physics Reviews
Citation
VOL 6-041403-12
Abstract
Many applications, most notably memory and optical devices use ferroelectric materials. For many years the evolution of the field has revolved around understanding the materials science behind complex structures like artificial superlattices based mainly on perovskitestructure oxides. The recent discovery of ferroelectricity in fluorite-structure oxides has opened a new research direction. However, the formation of unstable or metastable phases in atomic layer deposited fluorite oxides has inhibited a full understanding of the origin of ferroelectricity in these materials. This work reports a comprehensive study of the structural and electrical properties of HfO2 and ZrO2 nanolaminates and superlattices of various layering combinations and thicknesses. The structural investigations provide insight into how to optimize conditions during atomic layer deposition to avoid the formation of unstable phases. Investigations showed that the starting layer of the material, the thickness ratio between HfO2 and ZrO2 layers, and the single-layer thickness strongly effected the ferroelectric properties. The influence of single-layer thickness related most strongly to the presence of interfacial nonferroelectric layers between the HfO2 and ZrO2 deposits. These features make the structures highly promising candidates for next-generation memory applications. Potentially other fluorite-structure oxides might also function as building blocks for nanolaminates and superlattices.
URI
http://pubs.kist.re.kr/handle/201004/70094
ISSN
1931-9401
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KIST Publication > Article
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