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000878255 1001_ $$0P:(DE-HGF)0$$aHu, Tian-Yi$$b0
000878255 245__ $$aEnhanced Energy Storage Performance of Lead-Free Capacitors in an Ultrawide Temperature Range via Engineering Paraferroelectric and Relaxor Ferroelectric Multilayer Films
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000878255 520__ $$aIndustry has been seeking a thin-film capacitor that can work at high temperature in a harsh environment, where cooling systems are not desired. Up to now, the working temperature of the thin-film capacitor is still limited up to 200 °C. Herein, we design a multilayer structure with layers of paraferroelectric (Ba0.3Sr0.7TiO3, BST) and relaxor ferroelectric (0.85BaTiO3–0.15Bi(Mg0.5Zr0.5)O3, BT–BMZ) to realize optimum properties with a flat platform of dielectric constant and high breakdown strength for excellent energy storage performance at high temperature. Through optimizing the multilayer structure, a highly stable relaxor ferroelectric state is obtained for the BST/BT–BMZ multilayer thin-film capacitor with a total thickness of 230 nm, a period number N = 8, and a layer thickness ratio of BST/BT–BMZ = 3/7. The optimized multilayer film shows significantly improved energy storage density (up to 30.64 J/cm3) and energy storage efficiency (over 70.93%) in an ultrawide temperature range from room temperature to 250 °C. Moreover, the multilayer system also exhibits excellent thermal stability in such an ultrawide temperature range with a change of 5.15 and 12.75% for the recoverable energy density and energy storage efficiency, respectively. Our results demonstrate that the designed thin-film capacitor is promising for the application in a harsh environment and open a way to tailor a thin-film capacitor toward higher working temperature with enhanced energy storage performance.
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000878255 7001_ $$00000-0002-7824-7930$$aMa, Chunrui$$b1$$eCorresponding author
000878255 7001_ $$0P:(DE-HGF)0$$aDai, Yanzhu$$b2
000878255 7001_ $$0P:(DE-HGF)0$$aFan, Qiaolan$$b3
000878255 7001_ $$0P:(DE-HGF)0$$aLiu, Ming$$b4
000878255 7001_ $$0P:(DE-Juel1)130736$$aJia, Chun-Lin$$b5
000878255 773__ $$0PERI:(DE-600)2467494-1$$a10.1021/acsami.0c05560$$gVol. 12, no. 23, p. 25930 - 25937$$n23$$p25930 - 25937$$tACS applied materials & interfaces$$v12$$x1944-8252$$y2020
000878255 8564_ $$uhttps://juser.fz-juelich.de/record/878255/files/acsami.0c05560.pdf
000878255 8564_ $$uhttps://juser.fz-juelich.de/record/878255/files/HU_TianYi.pdf$$yPublished on 2020-05-15. Available in OpenAccess from 2021-05-15.
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