Static and dynamic properties of thin films with space charges
Résumé
The physic of ferroelectric materials is supported by many key concepts connected with both experimental behaviors and theoretical approaches. One of them is especially important: the existence of space charges in ferroelectric materials. It has been firstly reported in the litterature about half a century ago and can be related to lots of mechanisms: screening, conduction, fatigue … By accounting for both thermodynamical and electrostatic aspects, we have investigated many points related to static and dynamical properties. The coupling between electric field and polarization leads to properties different from those of a classical semiconductor and from those of a ferroelectric insulator.