Oriented Perovskite Film from Laser Recrystallization in Magnetic Field

摘要: The orientation of crystals on the substrate and the presence of defects are critical factors in electro‐optic performance. However, technical approaches to guide the orientational crystallization of electro‐optical thin films remain challenging. Here, a novel physical method called magnetic‐field‐assisted pulse laser annealing (MAPLA) for controlling the orientation of perovskite crystals on substrates is reported. By inducing laser recrystallization of perovskite crystals under a magnetic field and with magnetic nanoparticles, the optical and magnetic fields are found to guide the orientational gathering of perovskite units into nanoclusters, resulting in perovskite crystals with preferred lattice orientation in (110) and (220) perpendicular to the substrate. The perovskite crystals obtained by MAPLA exhibit significantly larger grain size and fewer defects compared to those from pulsed laser annealing (PLA) and traditional …