Twinning in MAPbI3 at room temperature uncovered through Laue neutron diffraction
Joachim Breternitz, Michael Tovar, Susan Schorr
Abstract
Abstract The crystal structure of MAPbI 3 , the signature compound of the hybrid halide perovskites, at room temperature has been a reason for debate and confusion in the past. Part of this confusion may be due to twinning as the material bears a phase transition just above room temperature, which follows a direct group–subgroup relationship and is prone to twinning. Using neutron Laue diffraction, we illustrate the nature of twinning in the room temperature structure of MAPbI 3 and explain its origins from a group-theoretical point-of-view.
Topics & Concepts
Crystal twinningNeutron diffractionMaterials scienceDiffractionCrystallographyNeutronX-ray crystallographyPhysicsOpticsNuclear physicsChemistryMicrostructurePerovskite Materials and ApplicationsOptical properties and cooling technologies in crystalline materials2D Materials and Applications