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Silicon Products Bitterfeld (SPB) is active in the following fields:Production of silicon for photovoltaic and semi-conductor purposes and related products using the existing plant in Bitterfeld-Wolfen.Sale of know-how and engineering services on silicon production, chlorosilane processing and photovoltaics.-Research and development on the Siemens process for the production of low-cost silicon especially with the focus on cost reduction and quality improvement of silicon.