Abstract
Present work reports the fabrication of a multilayer (5-layer) structure of BiFeO3(BFO)/BaTiO3(BTO) using spin-coating technique. The crystallographic structure, surface morphology and ferroelectric behavior of multilayer structure in metal-ferroelectric-metal capacitor have been studied. Le-Bail refinement of X-ray diffraction data revealed the formation of polycrystalline pure perovskite phase with induced stress. The values of remnant (Pr) and saturation polarization (Ps) for BFO/BTO multilayer structure are found to be 38.14 μC/cm2 and 71.54 μC/cm2 respectively, which are much higher than the corresponding values reported for bare BFO thin film. A large value of dielectric constant of 187 has been obtained for multilayer structure with a low leakage current density of 1.09 × 10−7 A/cm2 at applied bias of 10 V. The BFO/BTO multilayer structure favors the enhanced energy storage capacity as compared to bare BFO thin film with improved values of energy-density and charge-discharge efficiency as 121 mJ/cm3 and 59% respectively, suggesting futuristic energy storage applications.
Highlights
The atomic scale combination of dissimilar materials is expected to produce striking control and ample scope of enhancement in new combinations of functional properties
The large value of stress modulus in BFO thin film is responsible for the increase in the lattice distortion which leads to an improvement in ferroelectric property of the multilayer structure
The BFO/BTO multilayer structure was fabricated on Pt/Ti/SiO2/Si substrate by sol-gel spin coating technique
Summary
The atomic scale combination of dissimilar materials is expected to produce striking control and ample scope of enhancement in new combinations of functional properties. Reddy et al reported improved ferroelectric as well as ferromagnetic properties for four-layered thin films over two-layered BLFCO-BFO thin films due to the interface coupling and interaction between the thin layers.[8] Pintilie et al studied the capacitance of PZO–PZT (80/20) multilayers with enhanced polarization with increase in number of interfaces due to the presence of some interfacial polarization, trapped charges at the multilayer interfaces.[9] Lee et al studied the enhancement of polarization by strain in superlattices of BaTiO3, SrTiO3 and CaTiO3.10 Wu et al observed the high saturation polarization in a (BaTiO3)8/(SrTiO3)[3] superlattice film.[11] Bao discussed that constructing multilayers or superlattices is an effective way to improve properties of ferroelectric/dielectric thin films.[12]. In the present work, an effort has been made to prepare a multilayered (five-layer) structure of BFO/BTO on Pt/Ti/SiO2/Si substrate using sol-gel spin coating method with the improved electrical property. The current-voltage (I-V) and capacitance-voltage (C-V) characteristics of prepared sample were studied using a semiconductor characterization system (Keithley; 4200 SCS) at room temperature
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