Space-charge-limited leakage current characteristics influenced by field-dependent permittivity in high dielectric constant and ferroelectric thin films

Abstract

The current-voltage relationship dominated by space-charge-limited conduction for high dielectric constant and ferroelectric thin films, including (Ba,Sr)TiO3 and Pb(Zr,Ti)O3, is derived taking into account the electric field dependence of permittivity. Typical current-voltage characteristics are given by the derived relationship with empirical values for its parameters. The obtained current characteristics might account for the high-field quasi-Ohmic region observed experimentally in the leakage current characteristics of a very thin BaTiO3 single crystal in the previous study [Morrison et al., Appl. Phys. Lett. 86, 152903 (2005)].