Abstract
With the development of electronic devices towards miniaturization, light weight and integration, dielectric thin film-capacitors for recoverable energy storage applications have attracted ever-growing interests owing to their fast charging and discharging rate. In continuation to our investigations for achieving high energy density, we have grown lead free BaZr0.2Ti0.8O3 (BZT)/Ba0.7Ca0.3TiO3 (BCT) heterostructures and studied the structural, dielectric, ferroelectric and energy density characteristics. The BZT/BCT bilayer epitaxial heterostructures were grown on La0.67Sr0.33MnO3 (LSMO) buffered LaAlO3 (LAO) single crystal substrate by optimized pulsed laser deposition technique. The ferroelectric phase transition has been probed above room temperature with relaxor behavior. These nanostructures show high discharge and charge energy densities of 9.74 and 26.55 J/cm3, respectively. These heterostructures show high dielectric permittivity, large polarization and high energy density characteristics well above room temperature which may be useful for both high power and energy density device applications.
Highlights
Fast and rapid depletion of natural resources such as fossil fuel and coal is driving researchers to focus continuously on the development of new technologies and exotic materials having high energy density and efficiency for both harvesting and storage of clean and green energy.[1,2] Electrical energy is stored in various forms of energy storage devices
As a need for compact and commercially practical electronic devices, the development of high power and high energy density materials are of primary importance.[4,5]
The BZT/BCT bilayer heterostructure were grown on LSMO buffered LAO single crystal substrate by optimized pulsed laser deposition technique
Summary
Fast and rapid depletion of natural resources such as fossil fuel and coal is driving researchers to focus continuously on the development of new technologies and exotic materials having high energy density and efficiency for both harvesting and storage of clean and green energy.[1,2] Electrical energy is stored in various forms of energy storage devices. Previous research shows that it is possible to improve those properties by suitable site engineering both at Ba2+ or/and Ti4+ site in BTO solid solutions Ba0.7Ca0.3TiO3 (BCT), BaZr0.2Ti0.8O3 (BZT), Ba0.7Ca0.3TiO3-BaZr0.2Ti0.8O3 (BCT-BZT) for various multifunctional applications.[5,6,12] Recently, Puli et al developed a leadfree pseudo binary epitaxial thin film of Ba0.955Ca0.045TiO3-BaZr0.17Ti0.83O3 and demonstrated a highest saturation polarization of 148 μC/cm[2] and a high recoverable energy storage density of 39.11 J/cm[3] at 2.08 MV/cm.[13] The Pb-free Ba0.7Ca0.3TiO3-BaZr0.2Ti0.8O3 (BCT-BZT) composite ceramics exhibit large piezoelectric coefficient of ≈ 620 pCN-1 and high dielectric permittivity due to the phase coexistence (rhombohedral and tetragonal phase) at morphotropic-phase boundary.[14]. The leakage current-voltage (I-V) characteristics, capacitance-voltage (C-V) characteristics, frequency dependent dielectric constant and temperature dependent capacitance measurement were performed using a programmable Keithley 4200 Semiconductor Characterization System
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