Colloidal synthesis of zinc-blende ZnSe nanoplatelets

Date

2024-9

Author

Es, Muhammed Said

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Two-dimensional semiconductor nanoplatelets (NPLs) have emerged as a highly promising class of colloidal nanocrystals for display technologies. They exhibit distinct properties, including narrow emission linewidths, high photoluminescence quantum yields, high absorption cross-sections, and suppressed Auger recombination. These exciting features have gained significant scientific interest and led to the demonstration of highly efficient red- and green-emitting NPLs with impressive performance in light-emitting devices and lasers. However, commonly studied two-dimensional NPLs face several challenges, including limited spectral coverage and the use of toxic metals. Therefore, it is crucial to develop environmentally friendly, non-toxic two-dimensional NPLs with suitable bandgap energy covering the blue spectral range. In this thesis, a new synthetic approach for the synthesis of two-dimensional zinc selenide (ZnSe) NPLs is investigated. The colloidal synthesis of ZnSe NPLs was developed by introducing two different zinc precursors: zinc acetate and zinc chloride. These additional zinc precursors modified the growth kinetics and enabled us to directly synthesize zinc-blende ZnSe NPLs with colloidal routes. The possibility of obtaining two different populations of ZnSe NPLs, characterized by their first excitonic peaks at 347 and 369 nm was also demonstrated. Additionally, the excitonic features of ZnSe NPLs were further tuned by replacing the initial oleic acid capping ligands with oleylamine and a significant redshift in the absorption peaks was observed. We believe that our findings will inspire further investigation in the synthesis of other non-toxic alternatives.

Subject Keywords

Colloidal nanocrystals, Two-dimensional, Semiconductor nanoplatelets (NPLs), Zinc selenide, Zinc-blende

URI

https://hdl.handle.net/11511/111010

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Graduate School of Natural and Applied Sciences, Thesis