Epitaxial Hf0.5Zr0.5O2 films: A temperature dependence study

Author:

Xiong Ke123ORCID,Huang Xinning3,Zhou Yong3ORCID,Xiao Yongguang12ORCID,Liao Lei4ORCID,Yan Haoran123,Lin Tie3ORCID,Shen Hong3ORCID,Chen Pan4,Wang Lifen4ORCID,Bai Xuedong4ORCID,Meng Xiangjian3ORCID,Wang Xudong3ORCID,Chu Junhao35ORCID,Wang Jianlu35ORCID

Affiliation:

1. Key Laboratory of Key Film Materials and Application for Equipments (Hunan Province), School of Material Sciences and Engineering, Xiangtan University 1 , Xiangtan, Hunan 411105, China

2. Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Material Sciences and Engineering, Xiangtan University 2 , Xiangtan, Hunan 411105, China

3. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences 3 , No.500 Yutian Road, Shanghai 200083, China

4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 4 , Beijing 100190, China

5. Shanghai Frontier Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Fudan University 5 , Shanghai 200433, China

Abstract

Hafnia-based films are gaining prominence in the advancement of next-generation memory and logic devices. Their significance arises from their pronounced ferroelectricity at the nanoscale and their synergy with silicon processes. However, there are questions surrounding how their polarization stability responds to changes in temperature. In our study, we synthesized (111)-oriented Hf0.5Zr0.5O2 (HZO) ferroelectric thin films through pulsed laser deposition. This process corroborated the domain-matching epitaxy growth mechanism. We observed that HZO films possess distinct temperature-dependent ferroelectric traits. Specifically, a decrease in temperature triggers a fall in remanent polarization. Notably, the coercive field diminishes initially, only to rebound around the 200 K mark. Utilizing low-temperature in situ x-ray diffraction techniques, we have identified that lattice strain, induced by the differing thermal expansion of the films due to temperature changes, alters the migration rate of oxygen vacancies, resulting in the observed variations in remanent polarization and coercive field as reported in the article. Our findings deepen the understanding of ferroelectric mechanisms inherent in hafnia-based oxide thin films.

Funder

National Key Research and Development Program of China

Strategic Priority Research Program of the Chinese Academy of Sciences

Cultivation Projects of National Major R & D Project

the Key Project of Scientific Research Fund of Hunan Provincial Education Department

Foundation of Innovation Center of Radiation Application

Shanghai Sailing Program

Publisher

AIP Publishing

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