Increasing recoverable energy storage in electroceramic capacitors using “dead-layer” engineering

M. McMillen, A. M. Douglas, T. M. Correia, P. M. Weaver, M. G. Cain, J. M. Gregg

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47 Citations (Scopus)
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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 Jcc1 to 17 Jcc1.
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.
Original languageEnglish
Article number242909
Number of pages4
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 10 Dec 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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