Humidity effects on the redox reactions and ionic transport in a Cu/Ta2O5/Pt atomic switch structure

Tohru Tsuruoka, Ilia Valov, Cedric Mannequin, Tsuyoshi Hasegawa, Rainer Waser, Masakazu Aono

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Redox reactions at the Cu/Ta2O5 interface and subsequent Cu ion transport in a Ta2O5 film have been investigated by means of cyclic voltammetry (CV) measurements. Under positive bias to the Cu electrode, Cu is preferentially oxidized to Cu2+ and then to Cu+. Subsequent negative bias causes a reduction of the oxidized Cu ions at the interface. It was found that CV curves change drastically with varied relative humidity levels from 5 to 85%. At higher humidity levels, the ion concentrations and diffusion coefficients, estimated from the CV curves, suggest increased redox reaction rates and a significant contribution of proton conduction to the ionic transport. The results indicate that the redox reactions of moisture are rate-limiting and highlight the importance of water uptake by the matrix oxide film in understanding and controlling the resistive switching behavior of oxide-based atomic switches.

    Original languageEnglish
    Article number06GJ09
    JournalJapanese Journal of Applied Physics
    Volume55
    Issue number6
    DOIs
    Publication statusPublished - 2016 Jun 1

    Fingerprint

    Redox reactions
    Cyclic voltammetry
    humidity
    Atmospheric humidity
    switches
    Switches
    Ions
    curves
    ion concentration
    moisture
    Oxide films
    Reaction rates
    oxide films
    Protons
    ions
    reaction kinetics
    Moisture
    diffusion coefficient
    conduction
    Electrodes

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

    Cite this

    Humidity effects on the redox reactions and ionic transport in a Cu/Ta2O5/Pt atomic switch structure. / Tsuruoka, Tohru; Valov, Ilia; Mannequin, Cedric; Hasegawa, Tsuyoshi; Waser, Rainer; Aono, Masakazu.

    In: Japanese Journal of Applied Physics, Vol. 55, No. 6, 06GJ09, 01.06.2016.

    Research output: Contribution to journalArticle

    Tsuruoka, Tohru ; Valov, Ilia ; Mannequin, Cedric ; Hasegawa, Tsuyoshi ; Waser, Rainer ; Aono, Masakazu. / Humidity effects on the redox reactions and ionic transport in a Cu/Ta2O5/Pt atomic switch structure. In: Japanese Journal of Applied Physics. 2016 ; Vol. 55, No. 6.
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    AU - Hasegawa, Tsuyoshi

    AU - Waser, Rainer

    AU - Aono, Masakazu

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