%0 Journal Article
%A Hu, Tian-Yi
%A Ma, Chunrui
%A Dai, Yanzhu
%A Fan, Qiaolan
%A Liu, Ming
%A Jia, Chun-Lin
%T Enhanced Energy Storage Performance of Lead-Free Capacitors in an Ultrawide Temperature Range via Engineering Paraferroelectric and Relaxor Ferroelectric Multilayer Films
%J ACS applied materials & interfaces
%V 12
%N 23
%@ 1944-8252
%C Washington, DC
%I Soc.
%M FZJ-2020-02724
%P 25930 - 25937
%D 2020
%X 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 °C. Herein, we design a multilayer structure with layers of paraferroelectric (Ba0.3Sr0.7TiO3, BST) and relaxor ferroelectric (0.85BaTiO3–0.15Bi(Mg0.5Zr0.5)O3, 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/cm3) and energy storage efficiency (over 70.93%) in an ultrawide temperature range from room temperature to 250 °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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:32412230
%U <Go to ISI:>//WOS:000541679900042
%R 10.1021/acsami.0c05560
%U https://juser.fz-juelich.de/record/878255