NTU Team Achieves a Highly Cycle-Stable Zirconium Dioxide Antiferroelectric Technology Capable of 100 Million Cycles

Fluorite-structured "zirconium dioxide (ZrO2)" has long been considered an antiferroelectric material with immense potential. However, traditional theory posits that its antiferroelectricity primarily originates from irreversible crystallographic phase transitions, which are accompanied by volume changes and lattice strain, subsequently degrading its stability and endurance under electric-field driving. A cross-institutional research team led by Prof. Tsung-Lin Hsieh from the NTU Department of Materials Science and Engineering has successfully challenged this long-standing theoretical framework. Utilizing precise "Atomic Layer Deposition (ALD)" technology and interface engineering design, the team successfully stabilized nanoscale ZrO2 thin films in a specific crystalline phase that maintains a nearly constant volume and can cycle reversibly between non-polar and polar structures. In this state, when a cyclic electric field is applied, the oxygen atoms within the zirconium dioxide only need to undergo minute displacements to complete the reversible structural transformation. This drastically mitigates the lattice strain and structural fatigue of the thin film while simultaneously exhibiting pronounced antiferroelectric characteristics.

The research team used advanced electron microscopy to observe the real-time structural changes of the nanoscale ZrO2 thin film under an applied electric field. Benefiting from the nearly isochoric (constant-volume), reversible "non-polar to polar" structural transformation mechanism, the ZrO2 thin film maintained extremely stable antiferroelectric behavior even after 100 million electric field cycles. This achievement, published in the top international journal Materials Today in 2026, not only redefines academia's understanding of antiferroelectric behavior in nanoscale fluorite oxides but also directly facilitates the development of high-efficiency gate materials, high-density memory, and micro energy storage systems. Jointly sponsored by the National Science and Technology Council (NSTC) and TSMC, this technological breakthrough from Taiwan provides a highly competitive material solution for next-generation electronic components.

This first author of this research is Hsin-Yu Hsieh, a Ph.D. student in NTU’s Department of Materials Science and Engineering. This cross-institutional collaboration involved the NTU’s Department of Materials Science and Engineering, the Department of Electrophysics at National Yang Ming Chiao Tung University, and the Department of Physics at National Sun Yat-sen University.

Full article: https://doi.org/10.1016/j.mattod.2026.103257