Research & Facilities

 Hybrid materials are materials prepared by com­bining organic and inorganic materials design­ned on the micro or nano scale. The combination of such materials leads to new exciting func­tio­nality and effects with highly tailorable properties. For the fabrication of inorganic materials we use sol-gel-based processes. Our focus is on wide-band-gap semiconductors, such as silicon carbide or zinc oxide which are very promising materials for numerous photonic applications. Various growth condi­tions lead to nano or micro crystals and fibers. Above all also porous and bulk semiconductors are grown.

The development of new materials needs a deep understanding of the materials properties. Thus various kinds of spectroscopy are needed. Among optical spectroscopy, our field of expertise is magnetic resonance spectroscopy with various techniques such as optically or electrically detected multiple resonance spectroscopy, allowing the determination of the microscopic structure and chemical nature of defects in materials.

Photonic Crystals

Photonic crystals are usually viewed as an optical analogue of semiconductors that modify the properties of light similarly to an 'atomic' lattice that creates a semiconductor band-gap for electrons. Photonic crystals are periodic dielectric or metallo-dielectric structures in which the…

Metamaterials

Metamaterials are artificial optical materials where the effective permeability (µ) and permittivity (ɛ) can be adjusted. Classical metamaterials have an adjustable positive µ and ɛ. They consist e.g. of coils and inductors far away from their resonance. However, close to the resonance of…

Sol-gel-based semiconductors …

The group has extensive experience in the development of sol-gel routes for the fabrication of wide-bandgap semiconductor materials. Among others silicon carbide (SiC), titanium dioxide (TiO2) and zinc oxide (ZnO) are of main interest. Depending on the sol-gel annealing procedure one obtains…

Magnetic Resonance Spectroscopy…

Defects, even as contamination with extremely low concentration, may strongly determine the electrical and optical properties of materials. Thus, the knowledge of the chemical nature and their microscopic structure is important either to avoid them or to use them technologically. A powerful…

Head

Prof. Dr. Siegmund Greulich-Weber


University of Paderborn
Faculty of Science
Department of Physics
Warburger Straße 100
33098 Paderborn
Germany

Tel.: +49 5251 60-2740
Fax: +49 5251 60-3247
E-mail: greulich-weber[at]physik.upb.de