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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Perovskites - organized by Eva M. Herzig (University of Bayreuth, Bayreuth)

CPP 7.9: Invited Talk

Tuesday, March 23, 2021, 14:00–14:40, CPPa

Structural dynamics of halide perovskites via in-situ electron microscopy — •Chen Li — Electron microscopy for Materials research (EMAT), University of Antwerp, Antwerp, Belgium

In-situ heating in electron microscopy is a powerful means of investigating phase changes in materials [1], and the focused electron probe in scanning transmission electron microscope (STEM) can also be used to stimulate the movement of atoms [2]. Here we apply such dynamic STEM to directly observe ion migration in both organic and inorganic halide perovskites. For instance, a phase transition from an orthorhombic δ-phase to a cubic α-phase in inorganic CsPbI3 perovskites has been tracked in atomic scale.

[1] C. Li, et. al., Secondary-phase-assisted grain boundary migration in CuInSe2. Phys. Rev. Lett. 2020, 124, 095702

[2] C. Li, et. al., Column-by-column observation of dislocation motion in CdTe: dynamic scanning transmission electron microscopy, Appl. Phys. Lett. 2016, 109, 143107