ZnO Nanowire Formation by Two-Step Deposition Method Using Energy-Controlled Hollow-Type Magnetron RF Plasma

Figure 8

Growth model of ZnO nanowires, corresponding to the phase (c) in Figure 7. Zn pillar of small size, formed initially on Zn thin film, is oxidized from its surface. Crystallization of ZnO occurs first at the tip of the pillar, and excess oxygen extracts Zn from the Zn layer. Then, ZnO nanowire extends upward, being accompanied with the Zn supply from the Zn layer. Finally, the growth of ZnO nanowire is completed because of a limit of Zn diffusion from the Zn layer.