Thickness and dielectric constant of dead layer in Pt/(Ba_(0.7)Sr_(0.3))TiO_3/YBa_2Cu_3O_(7-x) capacitor

摘要

Pt/(Ba_(0.7)Sr_(0.3))TiO_3 (BST)/YBa_2Cu_3O_(7-x) capacitors were prepared and investigated for the dead-layer (DL) thickness (t_d) and the DL dielectric constant (ε_d). Based on the series capacitor model, the t_d/ε_d ratio of 0.066 nm and the bulk BST ferroelectric-layer dielectric constant of 1370 were obtained through the measurements of the capacitance-voltage characteristics. The t_dxε_d value of 120 nm was obtained through the measurements of the current-voltage characteristics. Combining these data, the DL thickness and the DL dielectric constant are respectively estimated to be 2.8 nm and 42.6.