Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Quantum Dots and Wires: Growth

HL 48.5: Vortrag

Donnerstag, 21. März 2024, 16:00–16:15, EW 202

Separating nucleation and growth during the synthesis of perovskite quantum dots — •David Ederle, Jochen Feldmann, and Quinten A. Akkerman — Chair for Photonics and Optoelectronics, Department of Physics, Nano-Institute Munich, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

Due to their unique optoelectronic properties, colloidal lead halide perovskite quantum dots (LHP QDs) have received much attention in recent years.[1] With a near-unity photoluminescence (PL) quantum yield and highly tuneable PL with a narrow emission, this group of materials is of interest for research and applications such as light-emitting devices and photovoltaics. As the properties of the QDs strongly depend on their size and shape, complete control over their synthesis is crucial. Nonetheless, the search for suitable reaction conditions to synthesize LHP QDs of a certain size remains challenging.

Here, we present a synthesis protocol which allows to temporally separate the nucleation and growth, facilitating the synthesis of monodisperse QDs of a specific size.[2] In this process, in-situ absorption spectroscopy provides a suitable tool for live monitoring the kinetics of the nucleation and growth. This allows us to gain a better understanding of what drives the challenging synthesis of LHP QDs and how to control it.

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

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

Keywords: Perovskites; Quantum dots; In-situ spectroscopy