Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.122
Publication date: 18th December 2023
Nanoparticle supercrystals extend the fascinating properties of colloidal solutions of microscopic quantum dots to the macroscopic realm and are therefore of significant interest for various optoelectronic device applications such as solar cells, LEDs, electro-optic modulators, etc. [1]
We recently reported a study on defect/strain-related optical properties in self-assembled supercrystals of lead halide perovskites. Specifically, reproducibly observed spatial gradients in the photoluminescence energies and lifetimes of CsPbBr2Cl and CsPbBr3 supercrystals were shown to result from a combination of compressive strain, a loss of structural coherence, and an increasing atomic misalignment between adjacent nanocrystals. These findings expand on the idea of quantum dots functioning as quasi-atomic building blocks in the formation of macroscopic superstructures. [2]
The presentation will detail the spatially and temporally resolved optical measurements and present current efforts towards understanding and achieving control over the defect-related optical properties through adjustment of parameters both in the synthesis (particle size distribution, surfactant concentration) and the self-assembly (evaporation-method, -time, -temperature) of the nanoparticular building blocks. Furthermore we show that precise and quantifiable mechanical deformations and compressive strain induced by micromanipulators may be used to further explore the relationship between structural and optical properties of these superstructures.
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