Layne Frechette (UC, Berkeley): Theory and Simulation of a Microscopic Model for Cation Exchange in Nanocrystals

Research Project:

During a cation exchange reaction, the cations in a semiconductor nanocrystal are replaced by a different type of cation, while the anion sublattice remains intact. This process has been exploited to synthesize nanocrystal heterostructures and metastable structures – useful in optical and electronic applications – that are inaccessible by conventional synthesis techniques. However, the microscopic mechanisms of cation exchange remain unclear.

I have developed a model to study the microscopic basis of cation exchange, focusing specifically on the effect of lattice mismatch – the difference in size between different types of cations. Lattice mismatch creates effective long-ranged elastic interactions between cations, which results in interesting phase behavior and spatial organization of the cations in the lattice. While at the ESI, I will extend this model to incorporate additional effects, including changes in local bond environments and electrostatic interactions between cations. 

Coming soon.

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At a glance
Junior Research Fellow
April 9, 2018 — May 11, 2018