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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Organic Electronics and Photovoltaics III: Mobile and Trapped Charges (joint session CPP/DS/HL, organized by CPP)

CPP 21.10: Vortrag

Dienstag, 21. März 2017, 12:00–12:15, ZEU 260

Large area three-dimensional polarization control in P(VDF-TrFE) polymer 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, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland

Ferroelectric polymers are attractive candidates for functional layers in electronic devices like non-volatile memories, piezo- and magnetoelectric sensors, and capacitor-based high speed energy storage devices. Unfortunately, such thin films often reveal low di- and piezoelectric responses due to reduced crystalline and electrical dipole order, leading to compensation effects and low effective electric performance. One of the best characterized and often applied ferroelectric polymers is poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)). We will present results on micron-sized domains with three dimensional ferroelectric polarization alignment in P(VDF-TrFE) films on graphite. The ferroelectric domains have been achieved by a combined procedure of electrical poling and mechanical annealing with an atomic force microscopy tip. They show strongly increased lateral and vertical piezoresponse compared to the as-prepared film and can be deliberately written and switched.