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Rectifying Switching Characteristics of Pt/ZnO/Pt Structure Based Resistive Memory

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40 nm thick amorphous ZnO thin films were deposited by radio frequency magnetron sputtering at room temperature and asymmetric electrical switching characteristics are observed in the macroscopic symmetric Pt/ZnO/Pt structure. The crystal structure was examined by X-ray diffraction (XRD). The chemical bonding states of ZnO resistive switching layer was investigated by X-ray photoelectron spectroscopy (XPS). Keithley 4200 semiconductor characterization system was used to measure the current–voltage (IV) characteristics of the fabricated devices. The results reveal that a reversible resistive switching behavior between the high resistance state and the low resistance state with rectifying effects can be repeated for more than 100 dc cycles. This asymmetric electrical behavior is thought to be related to the naturally self-formed PtOx between ZnO film and the Pt bottom electrode, which introduces an energy barrier when electrons flow from top electrode towards the bottom electrode. The model of Pt/ZnO/Pt memory cell is expected to be able to alleviate the misreading error in cross-point array for high density integrations.
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Document Type: Research Article

Publication date: 2010-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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