Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.183
Publication date: 7th February 2022
Semiconductor nanoplatelets have attracted interest due to their exceptionally narrow optical features. However, the direct synthesis of semiconductor nanoplatelets is limited to nanoparticles with thicknesses from 2 to 6 monolayers (N monolayers NPLs present N+1 planes of cations alternated with N planes of chalcogens in the [001] direction of the zinc blende crystal structure). It thus limits the wavelength range reached by such materials. Here, we show that it is possible to synthesize thicker NPLs by carefully tuning the NPLs surface energy. The native carboxylate ligands are exchanged with halides ligands which induce a further dissolution of the NPLs and a recrystallization of the released monomers on the top and bottom wide facets. This versatile method is applied to all three cadmium chalcogenide semiconductor. Thus, in NPLs, where the surface represents a high ratio of the particles, the surface chemistry is a key factor. In the second part of the presentation, we will show that the control of surface chemistry is also a way to tune the shape of the NPLs.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Ne2DeM grant agreement n° 853049)
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