The crystal structure of MAPbI, 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 and explain its origins from a group-theoretical point-of-view.
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| http://dx.doi.org/10.1038/s41598-020-73487-1 | DOI Listing |
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