Reversible transition between the polar and antipolar phases and its implications for wake-up and fatigue in HfO2-based ferroelectric thin film

Yan Cheng, Zhaomeng Gao, Kun Hee Ye, Hyeon Woo Park, Yonghui Zheng, Yunzhe Zheng, Jianfeng Gao, Min Hyuk Park, Jung-Hae Choi, Kan-Hao Xue, Cheol Seong Hwang () and Hangbing Lyu ()
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Yan Cheng: East China Normal University
Zhaomeng Gao: Chinese Academy of Sciences
Kun Hee Ye: Seoul National University
Hyeon Woo Park: Seoul National University
Yonghui Zheng: East China Normal University
Yunzhe Zheng: East China Normal University
Jianfeng Gao: Chinese Academy of Sciences
Min Hyuk Park: Seoul National University
Jung-Hae Choi: Electronic Materials Research Center, Korea Institute of Science and Technology
Kan-Hao Xue: Huazhong University of Science and Technology
Cheol Seong Hwang: Seoul National University
Hangbing Lyu: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Atomic-resolution Cs-corrected scanning transmission electron microscopy revealed local shifting of two oxygen positions (OI and OII) within the unit cells of a ferroelectric (Hf0.5Zr0.5)O2 thin film. A reversible transition between the polar Pbc21 and antipolar Pbca phases, where the crystal structures of the 180° domain wall of the Pbc21 phase and the unit cell structure of the Pbca phase were identical, was induced by applying appropriate cycling voltages. The critical field strength that determined whether the film would be woken up or fatigued was ~0.8 MV/cm, above or below which wake-up or fatigue was observed, respectively. Repeated cycling with sufficiently high voltages led to development of the interfacial nonpolar P42/nmc phase, which induced fatigue through the depolarizing field effect. The fatigued film could be rejuvenated by applying a slightly higher voltage, indicating that these transitions were reversible. These mechanisms are radically different from those of conventional ferroelectrics.

Date: 2022
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DOI: 10.1038/s41467-022-28236-5

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