ZnO nanowire-embedded Schottky diode for effective UV detection by the barrier reduction effect

Nanotechnology 21(11) 115205

https://doi.org/10.1088/0957-4484/21/11/115205

Joondong Kim, Ju-Hyung Yun, Chang Hyun Kim, Yun Chang Park, Ju YeonWoo, Jeunghee Park, Jung-Ho Lee, Junsin Yi and Chang-Soo Han

Abstract

A zinc oxide nanowire (ZnO NW)-embedded Schottky diode was fabricated for UV detection. Two types of devices were prepared. The ZnO NW was positioned onto asymmetric metal electrodes (Al and Pt) for a Schottky device or symmetric metal electrodes (Al and Al) for an ohmic device, respectively. The Schottky device provided a rectifying current flow and was more sensitive to UV illumination than the ohmic device. The Schottky barrier plays an important role for UV detection by a UV-induced barrier reduction effect. The fabrication of the ZnO NW-embedded Schottky diode and the UV reaction mechanism are discussed in light of the UV light-induced Schottky barrier reduction effect.