Nitride and oxide semiconductor-based sensor technologies

In this project, the Nanostructures and Bioresponsive Materials groups cooperate to develop biomolecule-semiconductor hybrid interface structures and to enable in situ tracking of biomolecular processes on these interfaces, thus contributing to new sensor concepts.

Modern semiconductor building blocks in optoelectronics and sensor technology mainly base on inorganic nanostructures. The integration of organic molecules with these inorganic structures will however play an important role for future developments. The physical and chemical properties of hybrid structures suited for innovative applications in sensor systems and optoelectronics are determined by their interfaces. Therefore, the project team aims for a detailed characterisation of the chemical properties and electronic processes on biomolecule-functionalised semiconductor surfaces under native conditions and for an optimisation of the respective analysing methods.

Nitride and oxide nanostructures are employed as model systems in this work. They are modified with organic molecules and characterised in vacuum as well as in aqueous surroundings. To do this, the scientists employ a multimethod approach, combining optical spectroscopy such as Raman and reflectance anisotropy spectroscopy with ambient pressure photoemission spectroscopy. Thus, they aim to gather structural information on the molecular level in aqueous surroundings and at the same time develop novel optical methods with high spatial resolution and sufficient contrast for analysing single nanostructures.