Interface-charge-coupled polarization response of Pt-ZnO-BaTiO 3-ZnO-Pt heterostructures: Three-layer model expansion

Venkata M. Voora, Tino Hofmann, Matthias Brandt, Michael Lorenz, Marius Grundmann, Mathias Schubert

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present a three-layer dielectric continuum model to study the electrical polarization properties of metal-oxide semiconductor heterostructures. The heterostructures are composed of c-plane (0001) wurtzite-structure (piezoelectric) ZnO and polycrystalline (111) textured perovskite-structure (ferroelectric) BaTiO3, which reveal coupling effects between the non-switchable ionic charge of the wurtzite-structure layer and the electrically switchable lattice charge of the perovskite structure layer at their common interfaces. This model expands our previous two-layer model approach [J. Electron. Mater 37, 1029 (2008)]. We calculate and discuss the highly symmetric Sawyer-Tower circuit response. The ferroelectric polarization in the BaTiO 3 layer gives rise to hysteresis observation. Formation of depletion zones within the ZnO layers produces polarization offsets, which strongly depend on the spontaneous polarization orientation and magnitude within the ZnO layers. Our model is in excellent qualitative agreement with experimental data from a ZnO-BTO-ZnO heterostructure, and we identify the spontaneous polarization orientation in both wurtzite structure ZnO layers by comparison with our model.

Original languageEnglish (US)
Title of host publicationTheory and Applications of Ferroelectric and Multiferroic Materials
PublisherMaterials Research Society
Number of pages8
ISBN (Print)9781615677580
StatePublished - 2008
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: Dec 1 2008Dec 4 2008

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2008 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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