Increasing recoverable energy storage in electroceramic capacitors using "dead-layer" engineering.
- Author(s):
- McMillen, M*, Douglas, A M*, Correia, T M, Weaver, P M, Cain, M G, Gregg, J M*
- Source:
- Appl. Phys. Lett., 2012, 101, (24), 242909
- ISSN:
- ISBN:
- NPL Doc. Ref:
- PDB: 6575 | DDB: 5585
- Document Type:
- Periodical article
- DOI:
- http://dx.doi.org/10.1063/1.4772016
Note: An asterisk after an author's name indicates a non-NPL author.
Abstract:
The manner in which ultrathin films of alumina, deposited at the dielectric-electrode interface, affect the recoverable energy density associated with (BiFeO3)0.6-(SrTiO3)0.4 (BFST) thin film capacitors has been characterised. Approximately 6 nm of alumina on 400 nm of BFST increases the maximum recoverable energy of the system by around 30% from ~13 Jcc-1 to ~17 Jcc-1. Essentially, the alumina acts in the same way as a naturally present parasitic "dead-layer", distorting the polarisation-field response such that the ultimate polarisation associated with the BFST is pushed to higher values of electric field. The work acts as a proof-of-principle to illustrate how the design of artificial interfacial dielectric "dead-layers" can increase energy densities in simple dielectric capacitors, allowing them to compete more generally with other energy storage technologies.
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