Abstract
We grew lead-free BaZr0.2Ti0.8O3 (BZT)/Ba0.7Ca0.3TiO3 (BCT) epitaxial heterostructures and studied their structural, dielectric, ferroelectric and energy density characteristics. The BZT/BCT epitaxial heterostructures were grown on SrRuO3 (SRO) buffered SrTiO3 (STO) single crystal substrate by optimized pulsed laser deposition (PLD) technique. These high-quality nanostructures exhibit high dielectric permittivity (∼1300), slim electric field-dependent polarization (P-E) curve with high saturation polarization (∼100 µC/cm2) and low remnant polarization (∼20 µC/cm2) through interface engineering to develop new lead-free ferroelectric system for energy storage devices. We observe an ultrahigh discharge and charge energy densities of 42.10 and 97.13 J/cm3, respectively, with high efficiency, which might be highly promising for both high power and energy storage electrical devices.
Highlights
Energy crisis will be the world’s number one problem due to the ever-growing energy demand and escalating energy prices
The dielectric layer stores electrostatic energy in the form of electric displacement induced by an applied electric field
The effect of dc electric field on the dielectric constant is usually measured from capacitance-voltage (C-V) characteristics to observe the ferroelectric nature of BZT/BCT thin film
Summary
Energy crisis will be the world’s number one problem due to the ever-growing energy demand and escalating energy prices. The energy density (W) and the efficiency (η) of the dielectric capacitors are determined by polarization (P) versus applied electric field (E) curve via Very high energy density of up to 62 J/cm[3] at an applied field of 3.13 MV/cm has been reported in lead-based relaxor-ferroelectric thin films[27].
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