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ACS applied materials & interfaces v.9 no.2, 2017년, pp.1585 - 1592   SCI SCIE
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Interfacial Redox Reactions Associated Ionic Transport in Oxide-Based Memories

Younis, Adnan (School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, ); Chu, Dewei ( School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, ); Shah, Abdul Hadi ( Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 790-784 Pohang, ); Du, Haiwei ( School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, ); Li, Sean ( School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, );
  • 초록  

    As an alternative to transistor-based flash memories, redox reactions mediated resistive switches are considered as the most promising next-generation nonvolatile memories that combine the advantages of a simple metal/solid electrolyte (insulator)/metal structure, high scalability, low power consumption, and fast processing. For cation-based memories, the unavailability of in-built mobile cations in many solid electrolytes/insulators (e.g., Ta2O5, SiO2, etc.) instigates the essential role of absorbed water in films to keep electroneutrality for redox reactions at counter electrodes. Herein, we demonstrate electrochemical characteristics (oxidation/reduction reactions) of active electrodes (Ag and Cu) at the electrode/electrolyte interface and their subsequent ions transportation in Fe3O4 film by means of cyclic voltammetry measurements. By posing positive potentials on Ag/Cu active electrodes, Ag preferentially oxidized to Ag+, while Cu prefers to oxidize into Cu2+ first, followed by Cu/Cu+ oxidation. By sweeping the reverse potential, the oxidized ions can be subsequently reduced at the counter electrode. The results presented here provide a detailed understanding of the resistive switching phenomenon in Fe3O4-based memory cells. The results were further discussed on the basis of electrochemically assisted cations diffusions in the presence of absorbed surface water molecules in the film.


  • 주제어

    resistive switching .   redox process .   electrochemical metallization .   absorbed moisture .   thin films.  

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