Bipolar resistance switching in Pt/CuOx/Pt via local electrochemical reduction

Kenneth D'Aquila, Charudatta Phatak, Martin V. Holt, Benjamin D. Stripe, Sheng Tong, Woon Ik Park, Seungbum Hong*, Amanda K. Petford-Long

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The local changes in copper oxidation state and the corresponding resistance changes in Pt/CuOx/Pt nanoscale heterostructures have been investigated using x-ray nanoprobe spectro-microscopy and current-voltage characterization. After gentle electroforming, during which the current-voltage behavior remains non-linear, the low resistance state was reached, and we observed regions of 160 nm width that show an increase in Cu K-alpha fluorescence intensity, indicative of partial reduction of the CuOx. Analysis of the current voltage curves showed that the dominant conduction mechanism is Schottky emission and that the resistance state is correlated with the Schottky barrier height. We propose that the reversible resistivity change in these Pt/CuOx/Pt heterostructures occurs through local electrochemical reduction leading to change of the Schottky barrier height at the interface between Pt and the reduced CuOx layers and to change of the CuOx resistivity within laterally confined portions of the CuOx layer. These experiments reveal important insights into the mechanism of resistance switching of Pt/CuOx/Pt performed in a current and voltage regime that does not create a metallic conduction path.

Original languageEnglish (US)
Article number242902
JournalApplied Physics Letters
Volume104
Issue number24
DOIs
StatePublished - Jun 16 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    D'Aquila, K., Phatak, C., Holt, M. V., Stripe, B. D., Tong, S., Park, W. I., Hong, S., & Petford-Long, A. K. (2014). Bipolar resistance switching in Pt/CuOx/Pt via local electrochemical reduction. Applied Physics Letters, 104(24), [242902]. https://doi.org/10.1063/1.4883398