Table 3. The relative stabilities (eV) of hole and electron at the three-phase junction and the rutile–anatase direct junction a .
Inter. | Bulk anatase | Bulk rutile | |
Indirect Model | |||
Hole | 0 | 0.30 | –0.05 |
Electron | 0 | 0.15 | 0.15 |
Direct Model | |||
Hole | 0 | 0.42 | 0.11 |
Electron | 0 | –0.04 | –0.16 |
aThe three-phase junction is represented by the anatase/TiO2-II crystal with a 12A/2II model and the rutile/TiO2-II crystal with a 4R/II model. The rutile–anatase direct junction is represented by a 8A/15R model. In each calculation, the energy of hole–electron at the interface (Inter.) is set as reference.