Production of polysilicon (9~11 n)
Silicon with a very high purity percentage, which is called polysilicon, has a very wide range of applications in the production of solar cells and also in the production of semiconductors used in electronic industries. The polysilicon used in the production of solar cells has a purity percentage of silicon in the range of 99.9999% (N6) to 99.999999% (N8). Ultra-pure polysilicon with a purity percentage of 99.9999999% (N9) to 99.999999999% (N11) is used in the manufacture of electronic semiconductors.
Currently, solar polysilicon technology includes more than half of the solar energy produced in the world, while monocrystalline silicon technology includes about 35%. In total, 90% of the solar energy used by humans is based on silicon technology.
Silicon metals with higher silicon grades (polysilicon) are used to produce solar cells. About 5 tons of polysilicon are required for a one-megawatt solar module. Polysilicon is also used to produce silicon wafers in electronic semiconductors. This type of silicon metal is used in advanced electronic industries such as computers, space communications, defense systems, photo radiation panels, etc.