Fig. 1. The block diagram of the experimental work.

Fig. 2. (Color online) (a) The schematic diagram of the experimental set-up. (b) The energy diagram of Schottky Ag/ZnO contact.

Fig. 3. SEM of nanostructured ZnO thin films coated by hydrothermal technique. (a) Single nano-flower. (b) Multi nano-flowers.

Fig. 4. XRD pattern of ZnO thin films coated by hydrothermal technique.

Fig. 5. I–V curves for Ag/ZnO/Al Schottky diode where ZnO nanorod thin films were deposited by hydrothermal technique.