| MAPbI3 Vibration (cm−1) | G-MAPbI3 Vibration (cm−1) | Previously reported [36] vibration (cm−1) | Attributed | MAPbI3 Vibration (cm−1) |
| 3450 | 3510 | 3350 - 3500 | O-H Stretch | 3450 |
| 3120 | 3118 | 3175 | N-H Stretch | 3120 |
| 2960 | 2960 | 2975 | C-H Stretch | 2960 |
| 2700 | 2703 | 2400 - 2702 | unidentified | 2700 |
| 1635 | 1630 | 1717 | C-O Bending | 1635 |
| 1570 | 1566 | 1582 | NH3 bending | 1570 |
| 1420 | 1408 | 1468 | NH3 bending | 1420 |
| 1370 | 1370 | 1422 | CH3 bending | 1370 |
| 1100 | 1100 | 1250 | CH3-NH3 rocking | 1100 |
| 930 | 930 | 950 | CH3-NH3 rocking | 930 |