Figure 2

Charge-injection from sub-superficial electrodes.

(a) I-V characteristic of the device. The red and blue lines indicate the curves acquired at increasing and decreasing voltage, respectively. (b) Plot in linear scale of the ohmic I-V behavior in the 0–95 V range. (c) Highlight of the PF behavior above the critical voltage V_a. The quantities reported on the axes are chosen to linearize the PF expression I ∝ V sinh(aV^1/2/kT).