SILICON TETRACHLORIDE[SiCl4]

  CAS Number 10026-04-7

·         Linear Formula SiCl₄

·         Molecular Weight 169.90

·          EC Number 233-054-0

·          MDL number MFCD00011229

·          PubChem Substance ID 24852870

Silicon tetrachloride is the inorganic compound with the formula SiCl₄. It is a colourless volatile liquid that fumes in air. It is used to produce high purity silicon and silica for commercial applications.

Detailed description

Uses

Silicon tetrachloride is used as an intermediate in the manufacture of polysilicon, a hyper pure form of silicon,^[2] since it has a boiling point convenient for purification by repeated fractional distillation. It is reduced to trichlorosilane (HSiCl₃) by hydrogen gas in a hydrogenation reactor, and either directly used in the Siemens process or further reduced to silane (SiH₄) and injected into a fluidized bed reactor. Silicon tetrachloride reappears in both these two processes as a by-product and is recycled in the hydrogenation reactor. Vapor phase epitaxy of reducing silicon tetrachloride with hydrogen at approximately 1250^oC was done:

SiCl
4(g) + 2 H
2(g) → Si(s) + 4 HCl(g) at 1250^oC^[6]

The produced polysilicon is used as wafers in large amounts by the photovoltaic industry for conventional solar cells made of crystalline silicon and also by the semiconductor industry.

Silicon tetrachloride can also be hydrolysed to fumed silica. High purity silicon tetrachloride is used in the manufacture of optical fibres. This grade should be free of hydrogen containing impurities like trichlorosilane. Optical fibres are made using processes like MCVD and OFD where silicon tetrachloride is oxidized to pure silica in the presence of oxygen.

PRICE

$183.54/KG OR $83.42/IB

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