Enhanced Energy Storage Performance of Lead-Free Capacitors in an Ultrawide Temperature Range via Engineering Paraferroelectric and Relaxor Ferroelectric Multilayer Films

• DOI: 10.1021/acsami.0c05560
• Publication Date: 2020-05-15T21:29:18Z
• Authors: Tian-Yi Hu; Chunrui Ma; Yanzhu Dai; Qiaolan Fan; Ming Liu; Chun-Lin Jia
• Keywords: Atmospheric temperature range; Thermal Stability; Film capacitor

Industry has been seeking a thin-film capacitor that can work at high temperature in harsh environment, where cooling systems are not desired. Up to now, the working of is still limited up 200 °C. Herein, we design multilayer structure with layers paraferroelectric (Ba0.3Sr0.7TiO3, BST) and relaxor ferroelectric (0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3, BT-BMZ) realize optimum properties flat platform dielectric constant breakdown strength for excellent energy storage performance temperature. Through optimizing structure, highly stable state obtained BST/BT-BMZ total thickness 230 nm, period number N = 8, layer ratio 3/7. The optimized film shows significantly improved density (up 30.64 J/cm3) efficiency (over 70.93%) an ultrawide range from room 250 Moreover, system also exhibits thermal stability such change 5.15 12.75% recoverable efficiency, respectively. Our results demonstrate designed promising application environment open way tailor toward higher enhanced performance.