Peter Woditsch

Industrial inorganic chemistry

Primary inorganic materials: water hydrogen hydrogen peroxide and inorganic peroxo compounds nitrogen and nitrogen compounds phosphorus and its compounds sulfur and sulfur compounds halogens and halogen compounds mineral fertilizers - phosphorus-containing fertilizers nitrogen-containing fertilizers potassium-containing fertilizers. Metals and their compounds: alkali and alkaline earth metals and their compounds aluminum and its compounds chromium compounds and chromium silicon and its inorganic compounds manganese compounds and manganese. Silicones: structure and properties economic importance silicone manufacture industrial silicon products. Inorganic solids: silicate products inorganic fibers construction materials enamels ceramics metallic hard materials carbon modifications fillers inorganic pigments. Nuclear fuel cycle: economic importance of nuclear energy availability of uranium and thorium nuclear reactor types nuclear fuel production disposal of waste from nuclear power stations.

Solar-grade Silicon

A new process for preparation of solar-grade silicon is presented. It is based on the reduction of silicontetrachloride with aluminium, performed as a gas-solid-reaction. It offers the possibility of continuous processing. The silicon is gained in grains with about one millimeter in diameter, depending on the aluminium used. The main advantage of the process is the low phosphorus and boron concentration of the silicon which fulfils the demands of photovoltaic application. Solar cells prepared by this material showed efficiencies up to 10,5%.