title: Polarization of ferroelectric films through electrolyte.
abstract: A simplified model is developed to understand the field and potential distribution through devices based on a ferroelectric film in direct contact with an electrolyte. Devices based on the ferroelectric polymer polyvinylidenefluoride-trifluoroethylene (PVDF-TrFE) were produced--in metal-ferroelectric-metal, metal-ferroelectric-dielectric-metal, and metal-ferroelectric-electrolyte-metal architectures--and used to test the model, and simulations based on the model and these fabricated devices were performed. From these simulations we find indication of progressive polarization of the films. Furthermore, the model implies that there is a relation between the separation of charge within the devices and the observed open circuit voltage. This relation is confirmed experimentally. The ability to polarize ferroelectric polymer films through aqueous electrolytes, combined with the strong correlation between the properties of the electrolyte double layer and the device potential, opens the door to a variety of new applications for ferroelectric technologies, e.g. regulation of cell culture growth and release, steering molecular self-assembly, or other large area applications requiring aqueous environments.
authors.affiliation: Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74 Norrköping, Sweden.
authors.forename: Henrik
authors.initials: H
authors.lastname: Toss
authors.forename: Negar
authors.initials: N
authors.lastname: Sani
authors.forename: Simone
authors.initials: S
authors.lastname: Fabiano
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Simon
authors.forename: Robert
authors.initials: R
authors.lastname: Forchheimer
authors.forename: Magnus
authors.initials: M
authors.lastname: Berggren