Enhanced energy storage properties of BaTiO3 thin films by Ba0.4Sr0.6TiO3 layers modulation

Abstract Electrostatic dielectric energy storage capacitors have attracted much attention recently for their fast charging-discharging speed and high power density. Trilayered Ba 0.4 Sr 0.6 TiO 3 /BaTiO 3 /Ba 0.4 Sr 0.6 TiO 3 (BST/BT/BST) thin films were prepared by spin-coating technique. The sandwich-structured thin films showed high dielectric constant (e r  = 952) and low dielectric loss (tanδ = 0.034) at room temperature (10 kHz). Moreover, the dielectric constant of the thin films demonstrated good frequency stability within the measured frequency range and broad capacitance variation (20 °C–160 °C, ΔC/C 25°C 3 and 33.9% at 1.44 MV/cm, respectively. The results indicated that BST/BT/BST heterostructure films would be an alternative way to improve the energy storage density of dielectrics for applications.