Boldt Group

Nanoscience

The properties of all nanomaterials originate from their interface. We engineer defined interfaces between nanomaterials and study how chemical and charge carrier dynamics impact each other.
Dr. Klaus Boldt

When you look at any nanostructured, functional material the new effects originate from interactions with an interface. This can either be the particle surface or an interface between two inorganic materials that lead to exciting properties that are not possible in a single material. It is the nature if this interface, e.g. a sharp change or a gradual transition between two semiconductors, that will control the behaviour of charge carriers and hence the performance of nanocrystal-based solar cells, catalysts, lasers, etc. 
The Boldt Group takes an interdisciplinary approach in which they look at dynamics on different time scales. On the one hand they develop the chemistry of nanocrystal formation, especially the origin of anisotropy, selective growth, and the formation of a material gradient. On the other hand they look at the dynamics of charge carriers at these interfaces and how they are controlled. “The goal is to design more and more complex nanostructures that are capable of performing as a single, functional unit,” explains Dr. Klaus Boldt. “For this we need to keep an eye on all different size- and timescales that are involved here. If, for example, we want to build a nanoparticle-based solar cell we need to control the movement of excited electrons, the migration of ions in the nanocrystal, and the interaction of particles with each other. For this we combine colloidal synthetic approaches with imaging and spectroscopic methods.”

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