Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Perovskite and photovoltaics I (joint session HL/CPP)

HL 25.10: Talk

Tuesday, March 17, 2020, 12:15–12:30, POT 251

Optical Printing of Single Perovskite Nanoparticles — •Andreas Niklas Rank, Carola Lampe, Moritz Gramlich, and Alexander Urban — Nanospectroscopy Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany

The investigation of single perovskite nanocrystals in different temperature regimes can reveal the fundamental optical properties of the individual nanocrystals and enable further improvement for optical applications. Spin-coating diluted dispersions is the typical approach to obtain films with single, separated nanocrystals. Another versatile method is optical printing, an already established approach for gold, silver and silicon nanoparticles. In this method, the optical forces of a focused laser beam are utilized to localize nanoparticles at specific positions on a substrate. A specific surface coating prevents unwanted binding of other nanoparticles. The remaining solution can be washed away, leaving only the printed nanoparticles bound to the substrate via Van der Waals forces. Here, we investigate the applicability of this method to perovskite nanocrystals. We look into different nanocrystal morphologies and compositions as well as important laser parameters and substrate materials. Adapting this method to perovskite nanocrystals would not only unlock facilitate the investigation of single perovskite nanocrystals but could also lead to complex, nanostructured substrates.