Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.129
Publication date: 16th December 2024
II-VI semiconductor nanoplatelets (NPLs) present optical features lacking of inhomogeneous broadening thanks to their 2D shape. Their thicknesses only present few atomic planes, such that any modifications of the surface chemistry induces a modification of their optical features. Recent studies have been dedicated to induce chiral light-matter interactions on these particles, to reach strong circular dichroism (CD) and circularly polarized luminescence (CPL) features, for example by grafting cysteine ligands on their surface.
Here, we propose to use chiral tartrate ligands [1]. Surprisingly, the exchange undergoes several stages, with an increase of the CD feature at the position of the heavy hole which red shifts over time followed by an inversion of the CD signal when the absorption saturates. The dissymmetry factor can reach values as high as 1.2 x 10-2. The peak inversion global aspect is influenced by the lateral aspect of the initial particle, the former surface chemistry, and the synthesis conditions.
This inversion is attributed to a mechanical relaxation of the ligand assembly that induces a different coupling between the inorganic core and the chiral ligands. This hypothesis is supported by surface chemistry characterization and XRD analysis.
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