Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.297
Publication date: 28th August 2024
The direct wet-chemical synthesis of 2D lead chalcogenide nanoplatelets yields photoluminescent materials with strong excitonic contribution at room temperature. [1-4] 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 2D PbSe QDs. These 2D nanocrystals have lateral dimensions of e.g. 6 x 5 nm2, a thickness of 1-3 PbSe monolayers and exhibit PL in the NIR between 860 – 1510 nm with a PL quantum yield of up to 60 %. [2,3] The highly efficient PL at fiber-optics-relevant telecommunication wavelengths renders colloidal lead chalcogenide 2D semiconductors intriguing materials for future solution-processable optics. Scanning tunnelling spectroscopy (STS) of single flat PbSe QDs revealsa 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. Our experimental observations are supported by theoretical calculations of the electronic band structure using the tight-binding approach.
In the second part of the talk I will focus on colloidal 2D PbS nanoplatelets (NPLs) with a thickness of 1-2 nm. [4] The PbS NPLs exhibit excitonic PL at 720 nm, directly tying to the typical PL limit of unmodified CdSe NPLs. In the first comprehensive study of the low-temperature PL from PbS NPLs we observe unique PL features in single PbS NPLs at 4 K, including narrow zero-phonon lines widths down to 0.6 meV. Time-resolved measurements identify trions as the dominant emission source with a 2.3 ns decay time. Sub-meV spectral diffusion and no immanent blinking over minutes is observed, as well as discrete jumps without memory effects. These findings advance the understanding and underpin the potential of colloidal PbS NPLs for optical and quantum technologies. [5]
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