Rectification effects in ZnO-based transparent self-switching nano-diodes

We report on the fabrication and characterization of the self-switching nano-diodes using zinc oxide films grown on glass substrates for use as transparent rectifiers. Diode-like characteristics were clearly observed. The current clearly increased with increases in the channel length and the turn-on voltage sifted toward zero volt with decreasing the channel width. Overall, we found that the rectifying characteristics can be controlled by the device geometry. The rectifying characteristics were further investigated by reducing the electron concentration. Although the current value decreased as a result of the to reduction in the electron concentration, it was found that rectifying characteristics, in particular the turn-on voltage, can be controlled by the electron concentration.