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| Estimated optical parameters | SS | MS | SSMS |
|---|---|---|---|
| Direct optical bandgap (Eg) (eV) | 1.08 | 1.33 | 0.42 |
| Indirect optical bandgap (Eg) (eV) | 0.86 | 0.97 | 0.32 |
| Refractive index (n) | 3.30 | 3.10 | 4.32 |
| Dielectric constant (ε) | 10.90 | 9.63 | 18.70 |
