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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics: Spectroscopy
HL 45.2: Vortrag
Donnerstag, 12. März 2026, 15:15–15:30, POT/0006
Thermal Broadening Statistics of Photoluminescence in Tunable Lead Halide Perovskite Nanocrystals — •Luca B. Reim, Leo Luber, and Alexander S. Urban — Nanospectroscopy Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich
Halide perovskite nanocrystals (NCs) exhibit excellent optoelectronic properties, including high quantum yields and composition-dependent, narrow photoluminescence (PL) that critically depend on control over NC size and uniformity. Understanding the mechanisms governing PL linewidths is therefore essential for evaluating material quality and device performance.
We synthesized size-tunable CsPbBr3 nanocubes under ambient conditions using machine-learning-optimized reaction protocols.[1] The NCs were drop-cast onto substrates and investigated via temperature-dependent PL spectroscopy in a closed-cycle cryostat from 9-300 K. To quantitatively analyze the spectral evolution, we applied a novel fitting approach that enables the extraction of size dispersion, temperature-dependent exciton populations, and signatures of the local energetic environment. The latter is strongly influenced by nanocrystal quality and ligand coverage and provides a sensitive probe of inhomogeneous broadening mechanisms.
These results offer detailed insight into the fundamental limits of emission linewidths in perovskite NCs and support the targeted optimization of materials for optoelectronic applications such as LEDs.
[1] N. A. Henke, et al., Adv. Mater. 2025, e09472.
Keywords: Perovskite; Nanocrystals; Photoluminescence; Nanocubes; Thermal Broadening