High voltage dielectric properties of spin coated BaTiO3 on Ni foils

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Abstract

The voltage dependence of the electrical leakage current density of chemical solution deposited BaTiO3 films on high purity Ni foils was investigated as function of the underlying Ni microstructure. Depending on the Ni heat-treatment prior to BaTiO3 deposition, it was found that pores in the dielectric followed the profiles of the underlying Ni grain boundary grooved microstructure. The electrical properties were then characterized on capacitors with and without the presence of Ni grain boundaries. When a Ni grain boundary from the substrate is present, it is found that the loss tangent of the capacitor rises rapidly when the dc bias exceeds ∼30kV/cm. The critical bias increases to ∼100kV/cm when no substrate grain boundaries are included in the capacitor. In addition, the C-V curves are much more symmetric when grain boundaries are absent. This disparity in the electrical behavior was analyzed in terms of the mechanisms of charge conduction across the Nidielectric interface. While a reversed biased Schottky emission mechanism dominates the currents in areas free of Ni grain boundaries, the barrier at the cathode is ineffective when Ni grain boundaries are present in the substrate leading to considerable leakage current dominated by the forward biased Schottky barrier at the anode. The results are important to both embedded and surface mount capacitors.

Original languageEnglish (US)
Title of host publication17th IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2008
DOIs
StatePublished - Dec 1 2008
Event17th IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2008 - Santa Fe, NM, United States
Duration: Feb 23 2008Feb 28 2008

Publication series

NameIEEE International Symposium on Applications of Ferroelectrics
Volume2

Other

Other17th IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2008
CountryUnited States
CitySanta Fe, NM
Period2/23/082/28/08

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Levi, R. D., Trolier-McKinstry, S. E., & Randall, C. A. (2008). High voltage dielectric properties of spin coated BaTiO3 on Ni foils. In 17th IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2008 [4693857] (IEEE International Symposium on Applications of Ferroelectrics; Vol. 2). https://doi.org/10.1109/ISAF.2008.4693857