High-performance BaZr0.35Ti0.65O3 thin film capacitors with ultrahigh energy storage density and excellent thermal stability

The ability to work at ultralow (similar to 90 degrees C) or ultrahigh (200 degrees C) temperature with superior energy storage properties is essential for dielectric capacitors to operate in harsh environments. Here, we realized an ultrahigh recoverable energy density (W-rec) (78.7 J cm(-3)) and efficiency (eta) (80.5%) in BaZr0.35Ti0.65O3 film capacitors through enhancing the breakdown electric field strength at room temperature. Moreover, the BaZr0.35Ti0.65O3 film capacitor exhibits great energy storage properties when measured from -150 degrees C to 200 degrees C. W-rec and eta can reach the value of 41.9 J cm(-3) and 66.4% under an electric strength of 4.0 MV cm(-1) even at 200 degrees C, respectively. Especially, the variation of both W-rec and eta at 200 degrees C during 1 x 10(6) cycles (ferroelectric fatigue tests) is less than 3%. All these reveal that the BZT film capacitor is a commendable material for application in equipment working in harsh environments.