Multi-functional properties of CaCu 3Ti 4O 12 thin films

A. A. Felix, J. L.M. Rupp, J. A. Varela, M. O. Orlandi

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In this work, electric transport properties of CaCu 3Ti 4O 12 (CCTO) thin films were investigated for resistive switching, rectifying and gas sensor applications. Single phase CCTO thin films were produced by polymeric precursor method (PPM) on different substrates and their electrical properties were studied. Films produced on LNO/Si substrates have symmetrical non-ohmic current-voltage characteristics, while films deposited on Pt/Si substrates have a highly asymmetrical non-ohmic behavior which is related to a metal-semiconductor junction formed at the CCTO/Pt interface. In addition, results confirm that CCTO has a resistive switching response which is enhanced by Schottky contacts. Sensor response tests revealed that CCTO films are sensitive to oxygen gas and exhibit n-type conductivity. These results demonstrate the versatility of CCTO thin film prepared by the PPM method for gas atmosphere or bias dependent resistance applications.

Original languageEnglish
Article number054512
JournalJournal of Applied Physics
Issue number5
StatePublished - 1 Sep 2012
Externally publishedYes


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