Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Electrical, Dielectrical and Optical Properties of Thin Films II

CPP 47.1: Vortrag

Mittwoch, 14. März 2018, 12:00–12:15, C 230

Aligned in-plane polarization and large piezoelectricity in P(VDF-TrFE) films on graphite — •Robert Roth¹, Martin Koch¹, Jakob Schaab², Martin Lilienblum², Thomas Thurn-Albrecht¹, and Kathrin Dörr¹ — ¹Institute of Physics, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany — ²Department of Materials, ETH Zürich, 8093 Zürich, Switzerland

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. One of the best characterized and often applied ferroelectric polymers is poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)). We will present results on aligning both in-plane and out-of-plane ferroelectric polarization in P(VDF-TrFE) films on graphite in a force microscope. Within written micron-sized domains, strong enhancement of both, lateral and vertical piezoresponses have been achieved. Polarization alignment in as-prepared films of several 10 nm thickness is controlled using a combined procedure of electrical poling and mechanical tip pressure. Micron-sized domains with uniform polarization orientation, within the resolution limit, allow one to overcome compensation effects which would be beneficial for various device applications.