Halide Segregation in Mixed-Halide Perovskites: Influence of A-Site Cations
Alexander J. Knight, Juliane Borchert, Robert D. J. Oliver, Jay B. Patel, P. G. Radaelli, Henry J. Snaith, Michael B. Johnston, Laura M. Herz
Abstract
lacks such low-barrier ionic pathways and is, consequently, more stable against halide segregation. However, under prolonged illumination, it exhibits a considerable ionic rearrangement throughout the bulk material, which may be triggered by an initial demixing of A-site cations, altering the composition of the bulk perovskite and reducing its stability against halide segregation. Our work elucidates links between composition, ionic pathways, and halide segregation, and it facilitates the future engineering of phase-stable mixed-halide perovskites.
Topics & Concepts
HalidePerovskite (structure)Ionic bondingPhase (matter)ChemistryBand gapIonPhotoluminescenceInorganic chemistryMaterials scienceChemical physicsCrystallographyOptoelectronicsOrganic chemistryPerovskite Materials and ApplicationsChalcogenide Semiconductor Thin FilmsSolid-state spectroscopy and crystallography