Leakage current behavior of (BiFeO3)m(SrTiO 3)m superlattice structures was studied and analyzed at different temperatures (303-473 K) in the light of various models. While bulk limited Poole-Frenkel emission was observed to dominate the leakage current in the temperature range of 303-383 K, the space charge limited conduction was observed up to 473 K. With a Poole-Frenkel emission type of conduction, the activation energy range of ∼0.06-0.25 eV was calculated. The physical parameters, calculated from the analysis, correlate with the intrinsic properties. Such analysis of leakage current facilitates interface engineering of heterostructures for device applications. © 2008 American Institute of Physics.

Ranjith Ramadurai

Department of Materials Science and Metallurgical Engineering

W. Prellier

J.W. Cheah

J. Wang

T. Wu

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Applied Physics Letters

dc leakage behavior and conduction mechanism in (BiFeO3) m(SrTiO3)m superlattices

Journal	Applied Physics Letters
ISSN	00036951