Low-Temperature Rapid Fabrication of ZnO Nanowire UV Sensor Array by Laser-Induced Local Hydrothermal Growth

Figure 5

(a) Schematic of ZnO NW based UV sensor fabricated by laser induced hydrothermal growth. ZnO NW array is grown selectively at the two edges of the electrodes by applying laser-induced growth twice. The resultant ZnO NW arrays form interconnecting ZnO NWs whose conductance changes upon UV illumination. (b) SEM image of the resultant ZnO NW based UV sensor (c) SEM image at higher magnification. It is noticeable that the NWs grown from different electrodes come into contact with each other. (d) 𝐼𝑉 curves of as-prepared device, the device after annealing process and the same device upon UV illumination.