Figure 3
O 1s XPS core-level spectra of (a) the m-plane ZnO and (c) the o-plane ZnO lattices before and after N-ion bombardment. (b) and (d) Fitting curves of the XPS curves with two Lorentzian functions shown in (a) and (c), respectively. The spectral areas of the high- and low-energy excitation peaks are denoted as A1 and A2, respectively. |