Table 1 Phonon frequency shift ∆ω, biaxial strain σ, bandgap shift ∆E g , estimated bandgap E ′ g from phonon frequency shift, measured bandgap E g from PL peak position for the LT-20, LT-21, and LT-32 samples
Sample | ∆ω(cm− 1) | σ(GPa) | ∆E g (eV) | E ′ g (eV) from Raman | E g (eV) from PL peak |
|---|---|---|---|---|---|
LT-20 | 1.75 | 0.28 | 5.91×10−3 | 3.39581 | 3.3926 |
LT-21 | 2.96 | 0.48 | 1.012×10−2 | 3.40012 | 3.4037 |
LT-32 | 1.46 | 0.23 | 4.85×10−3 | 3.39485 | 3.3912 |