Building the ideal crystal
Higher purity, better quality
Our intensive management system ensures consistent levels of quality
There are four processes in the production of polycrystalline silicon. In our factory, all of these processes are subject to an intensive management system that ensures our products a consistently high level of quality. Processes take place in closed systems to maintain the highest possible levels of purity. By keeping our processes ultra-clean, we can achieve and deliver purity at a world-class level.
Chlorination
The raw material is 98%-pure powdered metallurgical grade silicon that is made from silica rock. In the chlorination process, the material is reacted with hydrogen chloride at high temperatures to produce trichlorosilane gas. This is cooled and the trichlorosilane is collected in liquid form.
Distillation
The trichlorosilane produced in the chlorination process is repeatedly distilled to remove impurities. The result is "eleven-nines" (99.999999999%) pure trichlorosilane, purity of which is suitable for use in semiconductors.
Reduction
The high purity trichlorosilane is mixed with hydrogen gas and sent to the reduction furnace. The gas mixture is electrically heated inside the furnace, leaving fine crystalline deposits on the surface of thin silicon rods. This is the polycrystalline silicon. The distilled trichlorosilane and silicon tetrachloride produced in the reduction process, are delivered to customers as silane products for use in semiconductor and fiber optic cable applications
Finishing
The polycrystalline silicon produced in the reduction furnace is cut into special length rods (cut rods) or crushed into chunks, depending on the final application. Then the material is washed, inspected and packaged before being shipped to the customer.