Regensburg 2010 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 13: Poster II: Electrical, mechanical and optical properties, nonlinear dielectrics
DF 13.1: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Barrier heights, polarization switching and electrical fatigue in PZT ceramics with different electrodes — •Andreas Klein, Jürgen Rödel, Heinz von Seggern, Torsten Granzow, Feng Chen, Sergey Zukov, Robert Schafranek, Andre Wachau, and Julia Glaum — Technische Universität Darmstadt, Institute of Material Science, Petersenstraße 32, D-64287 Darmstadt, Germany
Metal Pt, transparent conductive oxide ITO (In2O3:10at% Sn) and metal oxide RuO2 were deposited by sputtering on PZT ceramics as electrodes. The Schottky barrier heights at the ferroelectric/electrode interfaces are determined by photoelectron spectroscopy. The barrier heights vary significantly and indicate a preference for either hole or electron injection. The polarization, strain, permittivity, and piezoelectric constant hysteresis loops are, however, identical for all electrodes. Very small changes are observed in the polarization dependence on time and applied field, which was studied over a broad time window ranging from 10−7 to 102 s for applied fields between 1 and 2 kV/mm. A 20% reduction of polarization after 106 bipolar cycling is observed for all the samples. In contrast to PZT thin films, the loss of remanent polarization with bipolar switching cycles does not depend on electrode material, indicating a different fatigue mechanism for thin film and bulk ceramics.