Peculiarities of Dipolar Ordering in Mixed Cation Halide Perovskites

Here, we present a multitechnique experimental study of structural phase transitions and dipolar dynamics in the novel mixed methylammonium (MA)/dimethylammonium (DMA) MA
_1-x
DMA
_x
PbBr
₃
hybrid perovskites. The obtained results demonstrate a suppression of the structural phase transitions and stabilization of the cubic phase even for a small amount of DMA cations. For high DMA concentration, we observe a disappearance of the structural phase transitions and emergence of a glassy phase of electric dipoles.