Relaxor-ferroelectric superlattices: high energy density capacitors
- 10 October 2012
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 24 (44), 445901
- https://doi.org/10.1088/0953-8984/24/44/445901
Abstract
We report the breakdown electric field and energy density of laser ablated BaTiO(3)/Ba((1-x))Sr(x)TiO(3) (x = 0.7) (BT/BST) relaxor-ferroelectric superlattices (SLs) grown on (100) MgO single crystal substrates. The dielectric constant shows a frequency dispersion below the dielectric maximum temperature (T(m)) with a merger above T(m) behaving similarly to relaxors. It also follows the basic criteria of relaxor ferroelectrics such as low dielectric loss over wide temperature and frequency, and 50 K shift in T(m) with change in probe frequency; the loss peaks follow a similar trend to the dielectric constant except that they increase with increase in frequency (~40 kHz), and satisfy the nonlinear Vogel-Fulcher relation. Well-saturated ferroelectric hysteresis and 50-80% dielectric saturation are observed under high electric field (~1.65 MV cm(-1)). The superlattices demonstrate an 'in-built' field in as grown samples at low probe frequency (1 kHz) which rules out the effect of any space charge and interfacial polarization. The P-E loops show around 12.24 J cm(-3) energy density within the experimental limit, but extrapolation of this data suggests that the potential energy density could reach 46 J cm(-3). The current density versus applied electric field indicates an exceptionally high breakdown field (5.8-6.0 MV cm(-1)) and low current density (~10-25 mA cm(-2)) near the breakdown voltage. The current-voltage characteristics reveal that the space charge limited conduction mechanism prevails at very high voltage.Keywords
This publication has 31 references indexed in Scilit:
- Nonlinear dielectric thin films for high-power electric storage with energy density comparable with electrochemical supercapacitorsIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2011
- High to ultra-high power electrical energy storagePhysical Chemistry Chemical Physics, 2011
- Improved Energy Storage Performance and Fatigue Endurance of Sr‐Doped PbZrO3 Antiferroelectric Thin FilmsJournal of the American Ceramic Society, 2009
- Electrical breakdown and ultrahigh electrical energy density in poly(vinylidene fluoride-hexafluoropropylene) copolymerApplied Physics Letters, 2009
- Enhancement of charge and energy storage in sol-gel derived pure and La-modified PbZrO3 thin filmsApplied Physics Letters, 2008
- A Dielectric Polymer with High Electric Energy Density and Fast Discharge SpeedScience, 2006
- Diagnostic of the self-healing of metallized polypropylene film by modeling of the broadening emission lines of aluminum emitted by plasma dischargeJournal of Applied Physics, 2005
- Status quo and future prospects for metallized polypropylene energy storage capacitorsIEEE Transactions on Plasma Science, 2002
- Alternative Gate Dielectrics for MicroelectronicsMRS Bulletin, 2002
- High-κ gate dielectrics: Current status and materials properties considerationsJournal of Applied Physics, 2001