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Extracted lattice parameters and optical properties of the GaSe layers grown on different substrates and the GaSe bulk.
| Substrate | In-plane surface lattice constant (Å) | Out-of plane lattice constant (Å) | Out-of plane compressive strain (%) | E22g mode (cm−1) | Biaxial in-plane tensile strain (%) | PL emission (eV) |
|---|---|---|---|---|---|---|
| GaAs (001) | 3.909 | 15.89 | 0.58 | 204.2 | 0.84 | 1.745 |
| GaN/Sapp | 3.849 | 15.91 | 0.46 | 205.2 | 0.70 | 1.840 |
| Mica | 3.780 | 15.94 | 0.26 | 205.7 | 0.63 | 1.902 |
| GaSe bulk | 3.755 | 15.98 | 0 | 210.2 | 0 | 2.045 |
