Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Semiconductor nanoparticles have optical properties tunable with their size and composition. Among these particles, 2D nanoplatelets (NPLs), are promising materials thanks to their optical properties free of inhomogeneous broadening. However, the optical properties are limited to the visible range when working with cadmium chalcogenides. To reach the infrared range, narrower band gap semiconductors need to be considered, such as mercury chalcogenides. The goal is to extend the optical properties in the IR range while keeping a narrow emission. However, the direct synthesis of mercury chalcogenide NPLs is thermodynamically unfavored, and the current cation exchange from cadmium to mercury chalcogenide is limited to 2 cationic atomic plans. A new cation exchange approach is developed by using silver cation as the catalyst to boost the cation exchange from cadmium chalcogenide to mercury chalcogenide NPLs. Different conditions are investigated in order to get NPLs with better morphology and optical properties. Finally, a series of NPLs with tunable emission in NIR are obtained.
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