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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.53: Poster

Dienstag, 8. März 2005, 16:30–19:00, Poster TU F

Electrical properties of semiconducting PZT films on gold surfaces — •F. Müller¹, J. Yukecheva², A.-D. Müller¹, and M. Hietschold¹ — ¹Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, 09107 Chemnitz — ²630092 Novosibirsk State Technical University (NSTU), Karl Marx avenue 20, Novosibirsk, Russia

PZT (lead zirconium titanat) is mainly known as ferroelectric material with a high dielectric permittivity and bistable polarization states, which leads to its application in actuators, nonvolatile memories and pyroelectric infrared sensors. Besides this, PZT is a semiconducting material with a band gap of 3.5 eV. The electrical investigation of the semiconducting properties, however, is difficult, because the typical dependencies are hidden behind the larger ferroelectric effects. In this work, we have shown that it is possible to prepare PZT thin films, which are semiconductive and not ferroelectric. The electrical properties of these films have been studied with various methods. From C(V)-curves, it was derived that the prepared PZT films are p-doped. The stability of the material was investigated with time dependent current spectroscopy.