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Thermal Stability of Mixed Cation Metal Halide Perovskites in Air
No full textWe study the thermal
stability in air of the mixed cation organicāinorganic
lead halide perovskites Cs<sub>0.17</sub>FA<sub>0.83</sub>PbĀ(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub> and Cs<sub>0.05</sub>(MA<sub>0.17</sub>FA<sub>0.83</sub>)<sub>0.95</sub>PbĀ(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub>. For the latter compound, containing both
MA<sup>+</sup> and FA<sup>+</sup> ions, thermal decomposition of the
perovskite phase was observed to occur in two stages. The first stage
of decomposition occurs at a faster rate compared to the second stage
and is only observed at relatively low temperatures (<i>T</i> < 150 Ā°C). For the second stage, we find that both decomposition
rate and the activation energy have similar values for Cs<sub>0.05</sub>(MA<sub>0.17</sub>FA<sub>0.83</sub>)<sub>0.95</sub>PbĀ(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub> and Cs<sub>0.17</sub>FA<sub>0.83</sub>PbĀ(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub>, which suggests
that the first stage mainly involves reaction of MA<sup>+</sup> and
the second stage mainly FA<sup>+</sup>
