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Enhanced ferroelectric and dielectric behaviors of PZT/BFO heterostructure via compositional development

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Abstract

Phase-pure perovskite structure Pb(Zr, Ti)O3 (PZT) thin films are successfully prepared on FTO/glass substrate via magnetron sputtering process, acting as buffer layers for the sol–gel-derived BiFeO3 (BFO) thin film. The existence of compressive strain of PZT buffer layer with various thicknesses was demonstrated through qualitative analysis, which can make the Gibbs-free energy flat and then reduce the ferroelectric domain reversal barrier, thereby influencing the ferroelectric performances. It showed that 100-nm PZT buffer layer is an optimal thickness, and the leakage current density of 100-nm PZT/BFO thin film is significantly decreased by 1–2 orders of magnitudes and the lowest value is obtained. And then BFO/PZT heterostructures in different modes are constructed and the related insulating, ferroelectric and dielectric performance are explored. With 100 nm PZT acting as buffer, enhanced ferroelectricity (at ± 490 kV/cm, Pr = 39.48 µC/cm2, Ec = 125.48 kV/cm) is obtained by modulating the number of interface between BFO and PZT to 7 (marked with Y-7), which is highly related to the reduced leakage current density (at ± 300 kV/cm, 10−5 A/cm2). It can be accounted for existence of compressive stress flattened Gibbs-free energy and increased interfaces number strengthened interfacial polarization. All these indicate that the formation of different heterostructures is promising for obtaining enhanced ferroelectricity.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. U1806221, 51672198), Innovation and Development Project of Zibo City (2017CX01A022), Instruction and Development Project for National Funding Innovation Demonstration Zone of Shandong Province (2016-181-11, 2017-41-1, 2017-41-3, 2018ZCQZB01, 2019ZCQZB03), Central Guiding Local Science and Technology Development Special Funds (Grant No. 2060503), and Key Research and Design Program of Shandong Province (2019GGX102011).

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Chao Yan, Huajun Sun & Huiting Sui

  2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Chao Yan, Huajun Sun & Huiting Sui

  3. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    **aofang Liu & Ye Wang

  4. Advanced Ceramics Institute of Zibo New & High-Tech Industrial Development Zone, Zibo, 255000, People’s Republic of China

    Huajun Sun & Huiting Sui

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  1. Chao Yan
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Correspondence to Huajun Sun.

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Yan, C., Liu, X., Sun, H. et al. Enhanced ferroelectric and dielectric behaviors of PZT/BFO heterostructure via compositional development. J Mater Sci: Mater Electron 32, 8185–8194 (2021). https://doi.org/10.1007/s10854-020-05024-9

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  • DOI: https://doi.org/10.1007/s10854-020-05024-9

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