McMillen, M*; Douglas, A M*; Correia, T M; Weaver, P M; Cain, M G; Gregg, J M* (2012) Increasing recoverable energy storage in electroceramic capacitors using "dead-layer" engineering. Appl. Phys. Lett., 101 (24). 242909

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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.

Item Type:	Article
Keywords:	ferroelectrics, deadlayer, capacitors, energy storage
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Identification number/DOI:	10.1063/1.4772016
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5693

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