Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Dielectric, Elastic and Electromechanical Properties
KFM 3.4: Vortrag
Montag, 1. April 2019, 10:50–11:10, PHY 5.0.21
Aligning In-Plane Polarization Multiplies Piezoresponse In P(VDF-TrFE) Films On Graphite — •Robert Roth1, Martin Koch1, Jakob Schaab2, Martin Lilienblum2, Frank Syrowatka3, Tino Band1, Thomas Thurn-Albrecht1, and Kathrin Dörr1 — 1Institute of Physics, Martin Luther University Halle-Wittenberg, Halle, Germany — 2Department of Materials, ETH Zürich, Zürich, Switzerland — 3Interdisciplinary Center of Materials Science, Martin Luther University Halle-Wittenberg, Halle, Germany
Ferroelectric polymers are attractive candidates for functional layers in electronic devices like non-volatile memories, piezo- and magnetoelectric sensors. However, thin films often reveal reduced di- and piezoelectric responses due to crystalline disorder and resulting non-aligned electrical dipoles leading to compensation effects. We will present results on controlled aligning of both in-plane and out-of-plane ferroelectric polarization in several 10 nm thick poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) films on graphite with a force microscope [1]. Micron-sized domains with well-defined shape can be written by a combined procedure of electrical poling and mechanical tip pressure scanning. The achieved uniform polarization orientation leads to strong enhancement in both, vertical and lateral piezoresponse. By variation of parameters, domain walls with defined angle can be formed within these areas and diverse special domain structures can be generated. This allows one to overcome compensation effects and get distinct domain patterns beneficial for various device applications.
[1] R. Roth et al., New J. Phys. 20 (2018), 103044.