Table 1 XPS core-level spectra curve-fitting results and VBM positions used to calculate VBO of the Ga 2 O 3 /GaN heterostructure
Sample | State | Binding energy (eV) | Bonding | FWHM (eV) |
---|---|---|---|---|
Ga2O3 | Ga 3d | 20.22 | Ga-O | 1.35 |
O1s | 531.15 | Ga-O | 1.58 | |
VBM | 3.10 | |||
GaN | Ga3d | 19.89 | Ga-N | 1.35 |
N1s | 397.18 | Ga-N | 1.18 | |
395.61 | Ga Auger | 1.89 | ||
393.44 | Ga Auger | 2.95 | ||
VBM | 2.22 | |||
Ga2O3/GaN | Ga3d | 20.56 | Ga-O | 1.23 |
19.57 | Ga-N | 1.03 | ||
O1s | 531.27 | Ga-O | 1.72 | |
N1s | 396.93 | Ga-N | 1.75 | |
395.36 | Ga-Auger | 2.36 | ||
393.19 | Ga-Auger | 3.02 |