The hybrid organic–inorganic perovskite (CH₃NH₃)PbI₃ may find application in next generation solid-state sensitised solar cells. Although this material and related perovskites were discovered many decades ago, questions remain concerning their diverse structural chemistry and unusual properties. The article presents a review of previous work and provides a detailed description of the preparation, structural characterisation and physical characteristics of (CH₃NH₃)PbI₃. The phase changes exhibited by (CH₃NH₃)PbI₃ have been probed using variable temperature powder and single crystal X-ray diffraction, combined with differential scanning calorimetry, thermogravimetric analysis and phase contrast transmission electron microscopy. The optical band gap for (CH₃NH₃)PbI₃ determined by UV-Visible spectroscopy was compared to values obtained from density-of-state simulation of the electronic band structure.

This article describes a variable temperature solid-state NMR and single crystal X-ray/neutron diffraction study of the hybrid perovskites (CH ₃ NH ₃ )PbX ₃ (X = I, Br and Cl).

Trends in the Young's Modulus and Hardness for the hybrid perovskites CH ₃ NH ₃ PbX ₃ (X = I, Br and Cl) are assessed in relation to the underlying chemical bonding.