Walter Schottky (1886–1976) -- The discovery of the quantum hall effect -- Light scattering in novel layered semiconductor structures -- Excitons and the electronic polarization in semiconductors -- On the present understanding of Schottky contacts -- Point defects and diffusion mechanisms in crystalline semiconductors -- Physics on fractal structures -- Calculation of phase diagrams for models of metallic alloys -- Bloch oscillations and the dissipative phase transition in Josephson junctions -- Light induced magnetization in semiconductors -- Semiconductor physics in ultra-pure germanium -- Transport properties of semiconductor heterostructures -- Band offsets in heterostructures -- Optics with gradients of free carrier concentration -- Instabilities in semiconductors: Domains, filaments, chaos -- Physics of metal organic chemical vapour deposition -- Power thyristors using IC-technology.