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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Crystallization, Nucleation and Self-Assembly

CPP 19.11: Vortrag

Dienstag, 28. März 2023, 12:30–12:45, MER 02

Unravelling the synthesis of halide perovskite nanoplatelets by SAXS — •Kilian Frank¹, Carola Lampe², Alexander S. Urban², and Bert Nickel¹ — ¹Soft Condensed Matter Group and CeNS, Faculty of Physics, LMU Munich — ²Nanospectroscopy Group and CeNS, Nano-Institute, Faculty of Physics, LMU Munich

Halide perovskite nanoplatelets (NPLs) are a promising material for optoelectronic applications, such as LEDs and single photon emitters. While highly scalable and reliable ligand-assisted synthesis routes exist, a detailed structural understanding of the underlying pathways is lacking. We elucidate the processes of nucleation, growth, and superstructure assembly of CsPbBr3 NPLs using in situ small-angle X-ray scattering (SAXS), total scattering (TS) and photoluminescence (PL) spectroscopy during the synthesis. Thereby we enable even better control of the platelet thickness on the monolayer level, and therefore of the emission wavelength, due to quantum confinement. For this purpose we built and used a specialized reaction cell for in situ synthesis at the beamlines P07 and P62 (PETRAIII, DESY, Hamburg). By SAXS analysis we follow the assembly of the constituents into a regular superstructure. In addition, we investigated the effect of post-synthetic treatment of the NPLs using the same setup to further enhance their optoelectronic properties. With our results we contribute to the development of assembly-based synthesis routes for size-tunable nanomaterials. Such materials are of particular interest to the perovskite community as building blocks for hierarchical structures.