High-purity polycrystalline silicon is the main product of Tokuyama's Electronic Materials Business. The Tokuyama Factory produces about 9,200 metric tons annually, which is the largest production capacity in Japan. Tokuyama manufactures this material using the Siemens method, and applies its technologies to attain silicon purity of 99.999999999%, a level that can improve the performance of semiconductors.

Tokuyama initially launched its Electronic Materials Business by supplying high-purity polycrystalline silicon as a raw material for semiconductor wafers. In recent years, polycrystalline silicon has been increasingly in demand as a material for solar cells, which are expected to play a greater role as a renewable energy. In this context, Tokuyama began constructing a polycrystalline silicon factory in Malaysia in 2011 to respond to growing demand worldwide. When in operation, one of the new production facilities is scheduled to produce 6,200 metric tons in 2013. Tokuyama intends to maintain its competitive edge by leveraging its technologies for ensuring high purity and the quality levels it has achieved in semiconductor applications to produce high-purity polycrystalline silicon for solar cells.

The Electronic Materials Business is also engaged in developing manufacturing processes for polycrystalline silicon. In addition to this product, the business manufactures and sells trichlorosilane, which is used to manufacture epitaxial wafers, and high purity metallic boron, an additive agent.