Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Focus Session: Ultrafast Processes in Organic Semiconductors and Perovskites II (joint session O/CPP)

O 88.3: Vortrag

Donnerstag, 21. März 2024, 15:45–16:00, MA 004

Confined Excitons in Lead Halide Perovskite Quantum Dots — •Lena Stickel, Anja Barfüßer, Quinten A. Akkerman, and Jochen Feldmann — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

In the past years, lead halide perovskite quantum dots (LHP-QDs) have gained massive attention, due to their unique optoelectronic properties.[1] We discuss sphere-like LHP-QDs, which exhibit distinct resonances in their absorption spectra.[2] By comparing experimental data with model calculations based on weak and strong confinement, the origin of these resonances was investigated. Pump-probe experiments show bleaching and induced absorption signals, which we assign to excitonic and biexcitonic transitions.[3] We further use these well-defined excitonic QDs to study the interaction between LHP-QDs and functionalized ligands.

[1] A. Dey et al. ACS Nano 2021, 15, 10775-10981.

[2] Q. A. Akkerman et al. Science 2022, 377, 1406-1412.

[3] A. Barfüßer et al. Nano Lett. 2022, 22, 8810-8817.

Keywords: Quantum Dot; Excitons; Lead Halide Perovskites