Effective strategy for optimizing the leakage current and ferroelectric polarization characteristics of BiFeO3_PVDF-TrFE nanocomposite films. Issue 16 (15th August 2021)

• Record Type: Journal Article
• Authors: Xu, Lingfang; Zhang, Yu; Gui, Chi; Fang, Hanshuo; Wang, Ruilong; Xiao, Haibo; Liang, Shiheng; Yang, Changping
• Is Part Of: Ceramics international. Volume 47:Issue 16(2021)
• Page Start: 23659
• Page End: 23664
• Publication Date: 2021-08-15
• Subjects: BiFeO3 -- PVDF-TrFE copolymer -- Leakage current -- Ferroelectric polarization -- Nanocomposites; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.04.276
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: BiFeO3 has been extensively studied as an important single-phase multiferroic material at room temperature in the application fields of energy storage, data storage, spintronics, and electro-magnetic sensors. However, the high leakage current caused by the presence of lattice defects such as vacancies constrains the further development of BiFeO3 . In this paper, we presented a facile method to overcome the high leakage problem via blending BiFeO3 nanoparticles into the ferroelectric copolymer PVDF-TrFE matrix and introducing a barrier layer beneath the top Pt dot electrode. The leakage current and ferroelectric characteristics of BiFeO3 _PVDF-TrFE nanocomposite films were discussed comprehensively. Consequently, compared with the composites without the barrier layer, the leakage current density of the BiFeO3 _PVDF-TrFE composite films reduced two orders of magnitude after coating a pure copolymer layer. Moreover, the remnant ferroelectric polarization reached ~14 μC cm −2 for a moderate weight content (25 wt%) of BiFeO3 nanoparticle in the blends, with a remarkably smaller coercive electric field than that of pure PVDF-TrFE films. An electrical conduction blocking mechanism was established to elucidate the optimized electric and ferroelectric properties of nanocomposite films.