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

doi:10.1063/1.4772016

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

Research output: Contribution to journal › Article › peer-review

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 6nm of alumina on 400nm 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.

Original language	English
Article number	242909
Journal	Applied Physics Letters
Volume	101
Issue number	24
DOIs	https://doi.org/10.1063/1.4772016
Publication status	Published - 10 Dec 2012
Externally published	Yes

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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 6nm of alumina on 400nm 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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AU - Douglas, A. M.

AU - Correia, T. M.

AU - Weaver, P. M.

AU - Cain, M. G.

AU - Gregg, J. M.

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

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