Publication date: 15th May 2025
Precursor Chemistry of Metallic and Semiconducting Nanocrystals
Two of the primary methods used to control the size and shape of nanocrystals include using precursor chemistry to influence precursor conversion rate or the addition of surface-binding ligands. This talk will focus on the chemistry of zinc sulfide nanocrystals, where we have quantitatively measured the precursor conversion rate of a library of substituted thiourea precursors and shown that unlike the cadmium and lead chalcogenides counterparts, zinc sulfide shows little to no influence of precursor conversion rate on nanocrystal size. Instead, adjusting the structure of the zinc precursor can be used to influence the nanocrystal size, likely through a surface effect. Interestingly, while the effect of electronics on the precursor structure is the same across the materials, adjusting the steric bulk of the precursors has an opposite effect for lead sulfide and zinc sulfide. This observation points to differences in the underlying mechanism between the materials. Finally, we will conclude with some work on silver nanocrystals that again emphasizes the role of surface chemistry on influencing nanocrystal shape and size.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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