Leakage current characteristics of Pt/Ba0.6Sr0.4TiO3/Pt thin-film capacitors

Leakage current characteristics of Pt/Ba0.6Sr0.4TiO3/Pt ferroelectric thin-film capacitors were investigated at the temperature range from 273 K to 393 K. It is implied that there are two conduction regions in the capacitors, i.e. ohmic behavior at low voltage (< 0.4 V) and Poole-Frenkel or Schottky emission mechanism at high voltage (> 1.8 V). The depletion layer widths calculated from Poole-Frenkel model and Schottky emission model are 36.9 nm similar to 61.5 nm and 6.8 nm similar to 11.5 nm, respectively. Moreover, the trapped level, the Schottky barrier height, the constant and the effective Richardson constant are 0.56 V, 0.49 V, 0.227A/cm(2).V and 1.15 x 10(-7) A/cm(2).K-2, respectively.