Abstract
Understanding and controlling the orientation factor is crucial in the design and optimization of ferroelectric thin films for energy storage applications. In this paper, relaxor ferroelectric 0.9(Na0.5Bi0.5)(Fe0.02Ti0.98)O3-0.1SrTiO3 (0.9NBFT-0.1STO) thin films with various orientation factors were deposited onto Pt/Mica substrate by adjusting key parameters for annealing process. Excellent energy storage performance with recoverable energy storage density (Wrec) and energy storage efficiency (η) of 27.90 J/cm3 and 75.75%, respectively are obtained for 0.9NBFT-0.1STO with relatively larger α(111) value. Excellent thermal stability at the temperature range of 20–140 °C, frequency stability in the range of 1.0–20.0 kHz, and fatigue resistance up to 1 × 108 cycles are obtained. This provides a way of designing NBT-based thin films with excellent energy storage performance.
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