Mechanical Properties of Ferro-Piezoceramics

The effect of external strain on the non-linear electromechanical behavior of a ferroelectric poly-crystal is investigated under different applied electric fields by using a phase field model. Simulation results show that the domain switching induced by electric field under a tensile strain is much easier than that under a compressive strain, which is attributed to that a multi-domain structure can be more easily formed under the tensile strain than in the case of compressive strain when the electric field is absent. It is also found that a compressive misfit strain increases the macroscopic coercive field and remnant polarization while a tensile misfit strain decreases both of them. In addition, a compressive strain decreases the non-linear dielectric constant while a tensile strain increases it.

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Physical Model for the Steep Subthreshold Slope in Ferroelectric FETs

Houdt

Roussel

2018

IEEE Electron Device Lett.

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Since many years, sub-60mV/decade switching has been reported in ferroelectric FETs. However, thus far these reports have lacked full physical explanation since they typically use a negative capacitance in the ferroelectric layer to be able to explain the experimental observations. Because negative capacitance as such is not a physical concept, we propose an alternative model that relies on the non-linear and non-equilibrium behavior of the ferroelectric layer. It is shown that a steep subthreshold slope can be obtained by a 2-step switching process, referred to as nucleation and propagation. Making use of the concept of domain wall motion as known also from fracture dynamics, we are able to explain the steep slope effect. A simple mathematical model is added to further describe this phenomenon, and to further investigate its eventual benefit for obtaining steep slope transistors in the sub-10nm era.Index Terms -FeFET, domain wall motion, polarization, dielectric response, steep subthreshold slope I.

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Mechanical Properties of Ferro-Piezoceramics

Cited by 3 publications

References 192 publications

Effective Electromechanical Properties of Heterogeneous Piezoelectrics

Effective Electromechanical Properties of Heterogeneous Piezoelectrics

The effect of strain on the domain switching of ferroelectric polycrystals

Physical Model for the Steep Subthreshold Slope in Ferroelectric FETs

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