Optimizing electrical properties correlated with SCLC mechanism in BiFeO3/P(VDF-TrFE) multilayer composite films

BiFeO 3 has profuse physical properties in multiferroics. However, significant leakage current constrains its utility in practical applications. In this paper, we synergistically embed BiFeO 3 nanoparticles in a ferroelectric crystal P(VDF-TrFE) base and use barrier layers to reduce the leakage current and promote the ferroelectric performance. Our finding indicate that the multilayer BiFeO 3 /P(VDF-TrFE) composite films equipped with barrier layers exhibit a leakage current below the magnitude of microampere level, a 99 % reduction compared to single-layer films. Additionally, the effective remnant ferroelectric polarization reaches 16 μC/cm 2 , a 66 % improvement. We combined the conductive mechanism analysis by fitting I - V curves and constructing energy band structures, uncovering that the essence of the optimization characteristics is related to a Space-Charge-Limited Conduction (SCLC) mechanism in the multilayer composite films. This research offers potential film solutions for a variety of electrical devices, supported by both experimental and theoretical perspectives.