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Figure 4
UPS spectra of nonpolar m-plane ZnO and polar o-plane lattices (a) before and (c) after N-ion bombardment. (b) and (d) Corresponding enlarged views near VBM with the fitted lines denoting the linear extrapolation of the UPS spectral edge. |
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Figure 4
UPS spectra of nonpolar m-plane ZnO and polar o-plane lattices (a) before and (c) after N-ion bombardment. (b) and (d) Corresponding enlarged views near VBM with the fitted lines denoting the linear extrapolation of the UPS spectral edge. |