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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.

Twinning in MAPbI3 at room temperature uncovered through Laue neutron diffraction