Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 23, Pages 25930-25937Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05560
Keywords
energy storage; high temperature; lead-free thin film; paraelectrics; relaxor ferroelectrics
Funding
- Natural Science Foundation of China [51702255, 51390472]
- National 973 projects of China [2015CB654903, 2015CB654603]
- Shaanxi Natural Science Foundation [2018JM5069]
- Fundamental Research Funds for the Central Universities
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Industry has been seeking a thin-film capacitor that can work at high temperature in a harsh environment, where cooling systems are not desired. Up to now, the working temperature of the thin-film capacitor is still limited up to 200 degrees C. Herein, we design a multilayer structure with layers of paraferroelectric (Ba0.3Sr0.7TiO3, BST) and relaxor ferroelectric (0.85BaTiO(3)-0.15Bi(Mg0.5Zr0.5)O-3, BT-BMZ) to realize optimum properties with a flat platform of dielectric constant and high breakdown strength for excellent energy storage performance at high temperature. Through optimizing the multilayer structure, a highly stable relaxor ferroelectric state is obtained for the BST/BT-BMZ multilayer thin-film capacitor with a total thickness of 230 nm, a period number N = 8, and a layer thickness ratio of BST/BT-BMZ = 3/7. The optimized multilayer film shows significantly improved energy storage density (up to 30.64 J/cm(3)) and energy storage efficiency (over 70.93%) in an ultrawide temperature range from room temperature to 250 degrees C. Moreover, the multilayer system also exhibits excellent thermal stability in such an ultrawide temperature range with a change of 5.15 and 12.75% for the recoverable energy density and energy storage efficiency, respectively. Our results demonstrate that the designed thin-film capacitor is promising for the application in a harsh environment and open a way to tailor a thin-film capacitor toward higher working temperature with enhanced energy storage performance.
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