See all entries for this property (20 total)
| Initial crystal system | orthorhombic |
| Final crystal system | tetragonal |
| Initial space group | Unknown |
| Final space group | Unknown |
| Direction | Unclear [conflicting suggestions] |
| Phase transition temperature | 162.0 K |
Hysteresis: Unknown, but aware of hysteresis
Starting materials: N/A
Product: MAPbI3 Thin-film on Si
Description: Not described.
Method: Absorption spectra
Description: Absorption spectra was obtained for 350–450 nm-thick perovskite thin-films on glass from room temperature down to 5 K. Samples were mounted in a liquid helium bath cryostat and illuminated with a halogen lamp. Absorption spectra were obtained using a 0.275m focal-length monochromator with a 150 lines/mm or 300 lines/mm grating and detected by a charge-coupled device (CCD) camera. A generalized version of the well-known Elliott formula was used to deduce the exciton binding energies and band gaps at successive temperatures. Refer to Fig. 2&3.
Comment: Thickness 350-450nm