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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Crystallization, Nucleation and Self-Assembly I

CPP 3.7: Talk

Monday, March 18, 2024, 11:30–11:45, H 0110

X-ray scattering techniques to study the nucleation and growth of anisotropic perovskite nanoparticles and 2D-phases — •Bert Nickel, Kilian Frank, Nina Henke, and Alexander Urban — Fakultät für Physik, Ludwig-Maximilians-Universität München

Lead halide perovskites are an emerging materials class for optoelectronic applications. Due to the ionic character of this semiconductor material, nucleation and growth processes differ profoundly from covalent semiconductor materials such as Si or GaAs. Successful solution based synthesis schemes provide shape and orientation control which is difficult to rationalize. We employ in-situ x-ray studies, especially small angle x-ray scattering (SAXS) and Bragg diffraction to study such non-classical nucleation pathways. Within this approach, we identify the water air interface [1] and internal interfaces in colloidal mesophases as driving forces for nucleation and growth.

[1] Elucidating the Origins of High Preferential Crystal Orientation in Quasi-2D Perovskite Solar Cells Lehner, L. E., Demchyshyn, S., Frank, K., Minenkov, A., Kubicki, D. J., Sun, H., Hailegnaw, B., Putz, C., Mayr, F., Cobet, M., Hesser, G., Schöfberger, W., Sariciftci, N. S., Scharber, M. C., Nickel, B., Kaltenbrunner, M. Advanced Materials 35 (5) 2208061 (2023)

Keywords: x-ray; SAXS; perovskite; nanoparticle; quantum dot