Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.374
Publication date: 7th February 2022
The direct synthesis of lead chalcogenide (PbX, X = S, Se, Te) based 2D semiconductors, so-called nanoplatelets (NPLs), yields photoluminescent materials with strong excitonic effects at room temperature [1] and high potential for optoelectronic applications at telecommunication wavelengths. [2]
We report a facile and direct wet chemical approach toward colloidal 2D PbSe NPLs with high emission efficiency. [2] The NPLs exhibit excitonic features in the range of 800 – 1000 nm and photoluminescence in the range of 900 - 1500 nm, with the respective positions being precisely tuneable by adjusting the NPLs lateral size via the reaction conditions. Postsynthetic surface treatment with metal and organic halide compounds results in increased photoluminescence quantum yields up to 50 % and strongly pronounced optical features, ascribed to a reduction of non-radiative recombination in the NPLs as well as a stabilization of the band-edge state, by saturation of undercoordinated surface sites.
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