Origin of Difference in Photocatalytic Activity of ZnO (002) Grown on a- and c-Face Sapphire

<table>O 1s XPS line obtained from ZnO thin films grown on a-plane and c-plane sapphire.</table>

International Journal of Photoenergy

Figure 4: Origin of Difference in Photocatalytic Activity of ZnO (002) Grown on a- and c-Face Sapphire 