An independent evaluation of silicon feedstock materials in terms of their suitability for photovoltaics entails analysis and processing right along the manufacturing chain, from the starting material to the finished solar cell. Thanks to the facilities at SIMTEC (Silicon Material Technology and Evaluation Center), which opened in 2008, we at Fraunhofer ISE can model all process steps, starting from the crystallization of multicrystalline blocks, and provide skilled and comprehensive analysis of the various intermediate stages from the feedstock to the finished cell.

Research focuses on the use of upgraded metallurgical silicon (UMG Si) for solar cells. Innovative approaches to coping with elevated concentrations of impurities in the silicon are investigated here. In order to minimize the introduction of additional impurities into the material during crystallization, we are also actively researching alternative crucible systems and coatings.

A modern sawing line is available for further processing the multicrystalline blocks. The materials produced in experimental crystallization procedures can thus be further processed into wafers and test specimens with specific geometries. These are then thoroughly characterized and, in cooperation with other departments, converted into finished solar cells.