Abstract:
Numerical modelling of the interaction of 10 MeV electrons with hybrid perovskites $\mathrm{Cs_xFA_{1-x}PbI_3}$ and $\mathrm{Cs_xMA_{1-x}PbI_3}$ was performed using the GEANT4 toolkit. The influence of cation composition variation on the nature of radiation processes, including ionisation, photoelectric effect, Compton and Rayleigh scattering, as well as energy losses, was studied. It was found that an increase in the proportion of $\mathrm{Cs^+}$ (atomic number $Z = 55$) leads to an increase in the proportion of ionisation and photoelectron absorption processes, which is associated with an increase in the atomic number and density of the material. At the same time, the proportion of Compton and Rayleigh scattering changes slightly, despite the redistribution of cations. It was also noted that with an increase in $\mathrm{Cs^+}$, the total energy absorption increases, but there is a simultaneous decrease in non-ionisation losses associated with the generation of radiation-induced defects. The obtained results allow the radiation resistance of various perovskite compositions to be assessed and may be useful for selecting the optimal material for space and nuclear-photon applications.
Keywords:perovskite solar cells, Monte Carlo simulation, electron irradiation, GEANT4, radiation-matter interaction.
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