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Etching-dependent Reproducible Memory Switching In Vertical SiO2 Structures

J. Yao, L. Zhong, D. Natelson, J. Tour
Published 2008 · Physics

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Vertical structures of SiO2 sandwiched between a top tungsten electrode and conducting nonmetallic substrate were fabricated by dry and wet etching methods. Both structures exhibit similar voltage-controlled memory behaviors, in which short voltage pulses (1 μs) can switch the devices between high- and low-impedance states. Through the comparison of current-voltage characteristics in structures made by different methods, filamentary conduction at the etched oxide edges is most consistent with the results, providing insights into similar behaviors in metal/SiO/metal systems. High ON/OFF ratios of over 104 were demonstrated.
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