Thermal evolution of ferroelectric behavior in epitaxial Hf0.5Zr0.5O2
- Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States); Lab. for Oxide Research and Education, Chicago, IL (United States)
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Barcelona (Spain)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Univ. of Illinois, Chicago, IL (United States); Lab. for Oxide Research and Education, Chicago, IL (United States)
In this paper, we report a cryogenic-temperature study on the evolution of the ferroelectric properties of epitaxial Hf0.5Zr0.5O2 thin films on silicon. Wake-up, endurance, and fatigue of these films are found to be intricately correlated, strongly hysteretic, and dependent on available thermal energy. Field-dependent measurements reveal a decrease in polarization with temperature, which has been determined not to be an intrinsic change of the material property, rather a demonstration of the increase in the coercive bias of the material. Our findings suggest that a deficiency in thermal energy suppresses the mobility of defects presumed to be oxygen vacancies during wake-up and trapped injected charge during fatigue, which is responsible for polarization evolution during cycling. This permits accelerated wake-up and fatigue effects at high temperatures where thermal energy is abundant but delays these effects at cryogenic temperatures.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Ministry of Science and Innovation; European Regional Development Fund (FEDER); Generalitat de Catalunya
- Grant/Contract Number:
- AC02-06CH11357; NSF-DMR-1508220; RYC-2017-22531
- OSTI ID:
- 1760016
- Alternate ID(s):
- OSTI ID: 1670235
- Journal Information:
- Applied Physics Letters, Vol. 117, Issue 14; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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