Thickness-dependent electrocaloric effect of Pb0.82Ba0.08La0.10(Zr0.90Ti0.10)O3 antiferroelectric thick films

Effects of thickness on dielectric properties and electrocaloric effect (ECE) of Pb 0.82 Ba 0.08 La 0.10 (Zr 0.90 Ti 0.10 )O 3 (PBLZT) antiferroelectric (AFE) thick films were systematically studied. As the thickness was increased, the Curie temperature of the thick films was increased, while their diffusing behavior was reduced. A giant reversible adiabatic temperature change of ΔT = 25.1 °C at room temperature was achieved in the PBLZT AFE thick film with a thickness of 1.0 μm. At the same time, the 1.0-μm-thick film had an electrocaloric coefficient of Δ T/ Δ E = 0.036 K cm/kV and a refrigeration efficiency of COP = 6.0 at room temperature. In addition, all samples had a low leakage current density of −6 A/cm 2 at room temperature. These results indicated that the PBLZT AFE thick films could be used for applications in solid-cooling devices by properly controlling their thickness.