Berlin 2005 – wissenschaftliches Programm
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SYFS: Nichtflüchtige Festkörperspeicher
SYFS 4: Poster
SYFS 4.2: Poster
Samstag, 5. März 2005, 08:30–16:30, Poster TU C
Asymmetric ferroelectric polarization loops and offset in Pt-ZnO-BaTiO3-Pt thin film capacitor structures — •Nurdin Ashkenov, Mathias Schubert, Evgeni Twerdowski, Nirav Barapatre, Holger v. Wenckstern, Holger Hochmuth, Michael Lorenz, Wolfgang Grill, and Marius Grundmann — Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany
Electric polarisation, current-voltage and capacitance-voltage studies on a wurtzite-perovskite-type metal/semiconductor/ferroelectric/metal heterostructure (Pt-ZnO-BaTiO3-Pt), grown by pulsed laser deposition on (001)Si are reported. Strongly asymmteric polarization hysteresis loops with rectifying behavior are observed. The polarization value in the negative half of the hysteresis loop is larger than that in the positive half of the loop, and hysteresis loops shift along the polarization axis with increasing sweeping voltage. The origin of the hysteresis loop offsets and asymmetry is discussed and modeled in terms of space-charge region, leakage currents, and coupling between spontaneous wurtzite and switchable ferroelectric polarization.