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Hysteretic curves of a cell with a gap of . A full voltage sweeping cycle follows this sequence: , and the cycle numbers are given in the figure. The voltage sweeping step was set to be . The inset is the sketch of a coplanar cell.
SEM image of a cell after resistive switching (on state). The dotted line indicates the original size of the Ag electrode.
The switching-on process while applying to a cell with a gap of : (a) curve, [(b), (c), and (d)] SEM images showing the Ag dendrite growth after applying for about 1, 2, and , respectively.
(Color) Field simulation results of the front-most Ag dendrite and the Ag electrode during switching-off: (a) Sketch of the Ag dendrite and the solid Ag electrode. (b) Tip of the Ag dendrite in higher magnification, representing the situation in the late on state. The blue lines represent equal potential lines after applying a switching-off voltage of . The voltage difference between two adjacent lines is . The black cones represent the electrical field and point to the direction of the ion migration. (c) The situation slightly later, representing the early off-state. The Ag dendrite retreats due to the dissolution of Ag. As soon as the electrical contact is disconnected, the field distribution changes, which accelerates the further dissolution of the dendrite tip.
Hysteretic curves of an cell with a gap of . The voltage sweeping step was set to be . The cycle numbers are given in the figure.
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