日本金属学会誌

J. Japan Inst. Metals, Vol. 73, No. 8 (2009),
pp. 589-594

Numerical Simulation of Silver Pillar Growth and Switching Behavior in Ag/Ag2S Nanometer Scale Switch

Yoshinao Okajima, Yasushi Shibuta, Shu Yamaguchi and Toshio Suzuki

Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656

Abstract:

The growth of silver pillars and switching behavior in Ag/Ag2S nanometer scale switch were numerically simulated. The mechanism of silver pillar growth, which is assumed to be the same one of the frost column growth, was modeled using a phase field method. Supply of the silver flux reduced by tunneling electron at the Ag/Ag2S interface into the upper part of the pillar led to the growth of silver pillar successfully. The growth velocity of the pillar increased with the increase of the applied voltage. However, it decreased by applying a potential necessary for the precipitation of silver from Ag2S phase. Moreover, the switching behavior was also well reproduced with the fact that switching time decreased with the increase of the switching voltage.


(Received 2009/4/30)

Keywords:

atomic scale switch, silver sulfide, pillar, numerical simulation, phase-field model


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