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Issue 7, 2019
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Lead-free A2Bi4Ti5O18 thin film capacitors (A = Ba and Sr) with large energy storage density, high efficiency, and excellent thermal stability

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Abstract

Lead-free thin film capacitors, simultaneously possessing a large energy storage density, ultrahigh efficiency and an extra wide working temperature range, are desirable in applications. In this work, A2Bi4Ti5O18 (A = Ba and Sr) thin films were successfully deposited onto Pt/Ti/SiO2/Si by chemical solution deposition. A large energy storage density (Ure) of 37.1 and 17.2 J cm−3 and a high efficiency (η) of 91.5% and 80.8% were achieved in Ba2Bi4Ti5O18 and Sr2Bi4Ti5O18 thin films, respectively. Moreover, these two thin films show excellent thermal abilities under an extra wide working temperature range from −100 °C to 180 °C. Additionally, high cycling fatigue endurance with a variation of the energy storage density of less than 3.7% and efficiency less than 2.1% after 2 × 108 charge–discharge cycles is obtained for these two thin films. These results indicate that A2Bi4Ti5O18 thin film capacitors have strong potential applications in equipment in harsh working environments.

Graphical abstract: Lead-free A2Bi4Ti5O18 thin film capacitors (A = Ba and Sr) with large energy storage density, high efficiency, and excellent thermal stability

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Publication details

The article was received on 05 Nov 2018, accepted on 14 Dec 2018 and first published on 17 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05558K
Citation: J. Mater. Chem. C, 2019,7, 1888-1895

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    Lead-free A2Bi4Ti5O18 thin film capacitors (A = Ba and Sr) with large energy storage density, high efficiency, and excellent thermal stability

    B. Yang, M. Guo, X. Tang, R. Wei, L. Hu, J. Yang, W. Song, J. Dai, X. Lou, X. Zhu and Y. Sun, J. Mater. Chem. C, 2019, 7, 1888
    DOI: 10.1039/C8TC05558K

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