Subsurface Characteristics of Metal-Halide Perovskites Polished by an Argon Ion Beam

Focused ion beam (FIB) techniques have been frequently used to section metal-halide perovskites for microstructural investigations. However, the beams directly irradiated sample surface may alter properties far different from pristine, potentially leading modified deterioration mechanisms under aging stressors. Here, we combine complementary approaches measure subsurface characteristics of polished perovskite and identify chemical species responsible measured properties. Analysis experimental results in conjunction with Monte Carlo simulations indicates that atomic displacements local heating occur methylammonium lead iodide (MAPbI3) by glazing Ar+ irradiation (15 nm 4 kV at 3 degree). The lead-rich, iodine-deficient promotes rapid phase segregation thermal conditions. On other hand, despite modification, our experiments confirm rest MAPbI3 bulk retains material integrity. Our observation supports could serve studying or buried junctions away altered care.