EFFECT OF K-EXCESS ON ENERGY STORAGE DENSITY AND EFFICIENCY OF Bi0.5K0.5+xTiO3 FILMS
In this work, we synthesized lead-free Bi0.5K0.5TiO3 (bismuth potassium titanate, BKT) ferroelectric films on Pt/Ti/SiO2/Si substrates via the chemical solution deposition. The microstructures, ferroelectric and energy-storage properties of the fi lms were investigated as a function of K-excess content. X-ray diffraction (XRD) patterns exhibited sharp diffraction peaks of the single-phase perovskite structure which confirmed that the films have reached the well-crystallized state. The films with K-excess content of 0.10 revealed the best ferroelectricity with the remnant polarization (Pr ) and maximum polarization (Pm) reaching the highest values of 9.6 μC/cm2 and 27.1 μC/cm2, respectively under the electric field of 400 kV/cm. These films also exhibited a large energy-storage density (Jreco ) of ~ 3.5 J/cm3. The obtained results indicate that the BKT fi lms have application potentials in advanced capacitors.
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