cm0c01692_si_001.pdf (1.51 MB)
Structure-Driven, Ferroelectric Wake-Up Effect for Electrical Fatigue Relief
journal contribution
posted on 2020-07-29, 14:09 authored by Teng Lu, Ye Tian, Andrew Studer, Qian Li, Ray L. Withers, Li Jin, Dehong Yu, Zhuo Xu, Xiaoyong Wei, Yun LiuIn
this work, we report the first observation of a structure-driven
ferroelectric (FE) wake-up effect in polycrystalline AgNbO3-based antiferroelectric (AFE) materials, by which polarization gradually
goes up with an increasing cycle number of the electric field. Unlike
the defect-driven FE wake-up effect broadly observed in HfO2-based thin films, this wake-up effect is associated with a phase
transition from AFE to FE under low-field cycling. Doping LiTaO3 into AgNbO3 disrupts the initial long-range ordered
octahedral tilting around the ⟨0 0 1⟩p direction,
resulting in some local regions with a lower energy barrier between
the AFE and FE phases. Therefore, under the cyclic field, the nucleation
and growth of the FE phase lead to the increasing polarization. Such
an intrinsic FE wake-up effect is more controllable and thus useful.
We have experimentally demonstrated that such a wake-up effect enables
compensation of the electrical fatigue, the fatal drawback that has
significantly limited the application of FE materials in smart devices,
such as non-volatile memory. We therefore believe that this work not
only provides new insight into the polarization–electric field
relationship of AFE materials, an important supplement to the existing
antiferroelectric theory, but also potentially introduces a new strategy
to solve the electrical fatigue problem for achieving fatigue-free
FE devices.