Table 1. Fitting Results of O 1s XPS Spectra of Commercial ZnO and VO-Rich ZnOa.
| mater. | oxy. | B. E. (eV) | perc. (%) |
|---|---|---|---|
| commercial ZnO | OL (Zn–O) | 530.07 | 84.57 |
| VO (vacancy) | 531.32 | 9.21 | |
| OC (chemisorbed) | 532.11 | 6.22 | |
| VO-rich ZnO | OL (Zn–O) | 530.14 | 52.36 |
| VO (vacancy) | 531.86 | 36.27 | |
| OC (chemisorbed) | 533.39 | 11.37 |
Mater.: materials; oxy.: oxygen species; B. E.: binding energy; and perc.: relative percentage.