Self-Restoration of a Wrinkled Hf_0.5Zr_0.5O₂ Ferroelectric Membrane

Haoran Ye ¹, Liqiang He ², Zhipeng Wang ³

⁰Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China.

Acs Applied Materials & Interfaces +

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April 14, 2025

View abstract on PubMed

Summary

Freestanding ferroelectric hafnium zirconium oxide (HZO) membranes exhibit remarkable self-restoration after significant mechanical deformation. This flexibility is crucial for developing durable, next-generation flexible electronic devices.

Area Of Science

Materials Science
Solid State Physics
Nanotechnology

Background

Ferroelectric oxides typically exhibit brittle deformation, limiting their use in flexible electronics.
Developing mechanically robust and flexible ferroelectric materials is critical for advanced device applications.

Purpose Of The Study

To investigate the self-restoration dynamics of ultrathin ferroelectric membranes under mechanical stress.
To explore the potential of zirconium-doped hafnium oxide (HZO) for flexible electronic applications.

Main Methods

Synthesized 10 nm thick wrinkled Hf0.5Zr0.5O2 (HZO) membranes using a damage-free peel-off process.
Studied self-restoration dynamics using in situ scanning probe microscopy and phase-field simulations.

Main Results

HZO membranes demonstrated full self-restoration to their original wrinkled state after deformation within a specific force range.
Exceptional flexibility was observed, with self-restoration occurring even after forces exceeding 100 nN completely collapsed wrinkles.
Phase-field simulations revealed a unique domain structure with continuous polarization variation in strained regions, crucial for self-restoration.

Conclusions

Freestanding HZO membranes possess an uncommon degree of flexibility and self-restoration capability among functional oxides.
This self-restoration property is vital for ensuring the long-term stability and reliability of flexible electronic devices like sensors and electronic skins.

Keywords:

ferroelectric membrane flexible electronics freestanding hafnium oxide phase-field simulation