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The band offsets in GeTe and Ge63Cu6Bi6Te63S12 among several valence band maxima, including VBM1 at the L point, VBM2 along the Γ-K direction and VBM3 along the Γ-X direction in Supplementary Fig. 8
| Band offset (meV) | ΔEVBM1-VBM2 | ΔEVBM1-VBM3 |
|---|---|---|
| GeTe | 67 | 273 |
| Ge63Cu6Bi6Te63S12 | −16 | 63 |
The negative band offset value of ΔEVBM1-VBM2 in Ge63Cu6Bi6Te63S12 is due to the shift of VBM from VBM1 to VBM2 under Cu-Bi-S doping.
