%0 Journal Article
%@ 2468-2179
%A Bui, Dinh Tu
%A Nguyen, Dang Co
%A Le, Viet Cuong
%A Pham, Duc Thang
%D 2019
%F SisLab:3538
%I Elsevier B.V
%J Journal of Science: Advanced Materials and Devices
%T Effect of Crystallization Temperature on Energy-Storage Density and Efficiency of Lead-Free Bi0.5(Na0.8K0.2)0.5TiO3 Thin Films Prepared by Sol-Gel Method
%U https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3538/
%X Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) ferroelectric films were synthesized on Pt/Ti/SiO2/Si substrates via the chemical solution deposition. The influence of the crystallization temperature on the microstructures, the ferroelectric and energy-storage properties of the films was investigated in detail. The results showed that the BNKT films have reached the well crystallized state in the single-phase perovskite structure at 700oC. Ferroelectric and energystorage properties of the films were significantly enhanced by increasing the crystallization  temperature. The remnant polarization (2Pr) and maximum polarization (2Pm) reached the highest values of 18.4 µC/cm2 and 61.2 µC/cm2, respectively, under the electric field of 300 kV/cm. Thanks to the strong enhancement in 2Pm and the large Pmax - Pr value, the highest energy-storage density (Jreco) and efficiency of 2.3 J/cm3 and 58.2%, respectively, were obtained. These results indicate that the BNKT films have application potentials in advanced  capacitors.