Fig. 5

Experimental results (open scatter) and the theoretical fitting results (solid line) of the I-V characteristics of the bistable devices measured under different atmospheres in different positive voltage regions. a Linear relationship between log I versus V ^1/2 in the voltage region of 0–4 V (OFF state); linear fitting in a double logarithmic plot in the region of b 4–15 V (OFF state), c 5–15 V (ON state), d 0–5 V (ON state)