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• W2300944107 abstract "Resistance switching is studied in HfO2 as a function of the anode metal (Au,Cu, and Ag) in view of its application to resistive memories (resistive random access memories, RRAM). Current-voltage (I-V) and current-time (I-t) characteristics are presented. For Auanodes,resistance transition is controlled by oxygen vacancies (oxygen-based resistive random access memory, OxRRAM). For Aganodes,resistance switching is governed by cation injection (Conducting Bridge random access memory, CBRAM). Cuanodes lead to an intermediate case. I-t experiments are shown to be a valuable tool to distinguish between OxRRAM and CBRAM behaviors. A model is proposed to explain the high-to-low resistance transition in CBRAMs. The model is based on the theory of low-temperature oxidation of metals (Cabrera-Mott theory). Upon electron injection, oxygen vacancies and oxygen ions are generated in the oxide. Oxygen ions are drifted to the anode, and an interfacial oxide is formed at the HfO2/anode interface. If oxygen ion mobility is low in the interfacial oxide, a negative space charge builds-up at the HfO2/oxide interface. This negative space charge is the source of a strong electric field across the interfacial oxide thickness, which pulls out cations from the anode (CBRAM case). Inversely, if oxygen ions migration through the interfacial oxide is important (or if the anode does not oxidize such as Au), bulk oxygen vacancies govern resistance transition (OxRRAM case)." @default.
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• W2300944107 date "2016-03-21" @default.
• W2300944107 modified "2023-10-10" @default.
• W2300944107 title "On the mechanisms of cation injection in conducting bridge memories: The case of HfO₂ in contact with noble metal anodes (Au, Cu, Ag)" @default.
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• W2300944107 doi "https://doi.org/10.1063/1.4943776" @default.
• W2300944107 hasPublicationYear "2016" @default.
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