The Effects of Ag Nanoislands on the Volatile Threshold-Switching Behaviors of Au/Ag/HfO₂/Ag Nanoislands/Au Devices

Figure 5

(a) When the positive voltage was applied to the TE, the CF grew from the top Ag layer to bottom to form a conduction channel facilitated by the accumulated electrons-enhanced localization of electric field (ΔE₁) at the tip of Ag NIs, (b) the CF dissolved under the positive voltage of ∼0 V, (c) when the negative voltage was applied to the TE, the CF grew from the Ag NI to the Ag layer and form a conduction channel facilitated by the accumulated Ag ions-enhanced localization of electric field (ΔE₂) at the tip of Ag NIs, and (d) the CF dissolved under the negative voltage of ∼0 V.

(a)

(b)

(c)

(d)