Fig. 4

FE-SEM images of (a) ZnOD, (b) ZnOD400, (c) ZnOD600, and (d) Cross-sectional FE-SEM image of ZnOD film deposited on the SiO2 layer.
FE-SEM images of (a) ZnOD, (b) ZnOD400, (c) ZnOD600, and (d) Cross-sectional FE-SEM image of ZnOD film deposited on the SiO2 layer.