Cathodoluminescence\nof MAPbCl₃ Halide Perovskite\nSingle Crystal

Abstract

Chloride\nperovskites are semiconductors with a near-ultraviolet\nbandgap that are promising for applications in optoelectronics and\nphotonics. One of the most studied representatives of this family\nis the methylammonium lead chloride MAPbCl₃ (MA⁺ = CH₃NH₃⁺). Low-temperature luminescence spectroscopy of this material\ndemonstrates a complex emission structure. In this work, we have studied\nthe cathodoluminescecne of the MAPbCl₃ halide perovskite\nsingle crystal at 70 K. Excitation by an electron beam was\nused to localize different emitters: excitons, defect-related states,\nand inclusions, previously assigned to the material itself. Exciton\nluminescence is observed from an undamaged sample, while the defect\nband is emitted from regions with dislocations, growth defects, and\ncrystal damage. Defect formation under electron beam irradiation was\nstudied. It was found that MAPbCl₃ is resistant to irradiation,\nwhich supports the defect tolerance of halide perovskites and paves\nthe way for their electron-beam modification for applications.