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Open AccessFeature PaperCommunication

Energy Storage Characteristics of BiFeO3/BaTiO3 Bi-Layers Integrated on Si

Key Laboratory for Liquid−Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Suzhou Institute of Shandong University, Suzhou 215123, China
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Author to whom correspondence should be addressed.
Academic Editor: Yuhang Ren
Materials 2016, 9(11), 935;
Received: 29 September 2016 / Revised: 27 October 2016 / Accepted: 11 November 2016 / Published: 18 November 2016
(This article belongs to the Special Issue Microwave Absorbing and Energy Storage Materials)
BiFeO3/BaTiO3 bi-layer thick films (~1 μm) were deposited on Pt/Ti/SiO2/(100) Si substrates with LaNiO3 buffer layers at 500 °C via a rf magnetron sputtering process. X-ray diffraction (XRD) analysis revealed that both BiFeO3 and BaTiO3 layers have a (00l) preferred orientation. The films showed a small remnant polarization (Pr ~ 7.8 μC/cm2) and a large saturated polarization (Ps ~ 65 μC/cm2), resulting in a slim polarization-electric field (P-E) hysteresis loop with improved energy storage characteristics (Wc = 71 J/cm3, η = 61%). The successful “slim-down” of the P-E loop from that of the pure BiFeO3 film can be attributed to the competing effects of space charges and the interlayer charge coupling on charge transport of the bi-layer film. The accompanying electrical properties of the bi-layer films were measured and the results confirmed their good quality. View Full-Text
Keywords: ferroelectrics; lead-free; energy storage; bilayer; BiFeO3; BaTiO3; Si ferroelectrics; lead-free; energy storage; bilayer; BiFeO3; BaTiO3; Si
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MDPI and ACS Style

Liu, M.; Zhu, H.; Zhang, Y.; Xue, C.; Ouyang, J. Energy Storage Characteristics of BiFeO3/BaTiO3 Bi-Layers Integrated on Si. Materials 2016, 9, 935.

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