Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.260
Publication date: 18th December 2023
The direct wet-chemical synthesis of two-dimensional (2D) lead chalcogenide semiconductors yields photoluminescent materials with strong excitonic contribution at room temperature. [1,2,3] In the spirit of the recent Nobel prize for the discovery and synthesis of quantum dots (QDs) we report herein on our studies of strongly confined wet-chemically synthesized flat lead selenide (PbSe) QDs. These 2D nanocrystals possess dimensions of e.g. 6 x 5 x 0.8 nm3 and exhibit PL in the near-infrared region between 860 – 1510 nm with a PL quantum yield of up to 60 %, which is mainly determined by their lateral dimensions. [1,2] Their highly efficient photoluminescence (PL) at fiber-optics-relevant telecommunication wavelengths renders colloidal lead chalcogenide 2D semiconductors intriguing materials for future solution-processable optics.
Scanning tunnelling spectroscopy of single PbSe NCs reveals a conduction and valence band density of states that is typical for QDs rather than a steplike function linked to 2D nanoplatelets and substantiates the strong confinement in the flat PbSe QDs. These experimental observations are substantiated by theoretical calculations of the electronic band structure using the tight-binding approach.
Our results paint a comprehensive picture of the optical and electronic properties of near-infrared active 2D PbSe QDs.
[4] Biesterfeld, L.; Biadala, L.; Lauth, J. Manuscript in preparation, 2023.
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