Question

Which process is used to obtain silicon of very high degree of purity?

Answer 1

1. Silicon of very high purity is obtained by the process of zone refining.
2. In this process, a circular heater moves slowly along a thin rod of impure silicon.
3. Impurities concentrate and shift towards one end, which is then removed.
4. The remaining rod is composed of silicon of very high purity.
5. This method is essential for semiconductor-grade silicon purification.