A guide to solar cells using Elkem Solar Silicon (ESSâ¢)
A guide to solar cells using Elkem Solar Silicon (ESSâ¢)
A guide to solar cells using Elkem Solar Silicon (ESSâ¢)
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Production<br />
of polysilicon<br />
1) No recycling of STC<br />
Production of<br />
Metallurgical grade silicon (MG-Si)<br />
SiO 2 (s) + 2C(s) → Si(l) + 2CO(g)<br />
(Source: A. Schei et al., 1998)<br />
Generation of TCS from<br />
Metallurgical grade Si<br />
Reaction:<br />
Si(s) + 3HCl(g) → SiHCl 3 (g) + H 2 (g)<br />
TCS<br />
Separation of TCS by<br />
distillations<br />
Decomposition<br />
in<strong>to</strong> polysilicon<br />
Removes Boron as BH 3 and Phosphorus as<br />
PCl 3 and POCl 3<br />
Decomposition reaction, simplified:<br />
~1100°C<br />
4SiHCl 3 (g) → Si(s) + 3SiCl 4 (g) + 2H 2 (g)<br />
TCS<br />
(Source:<br />
CDI, www.chemicaldesign.com)<br />
STC<br />
5<br />
(Source: www.gt<strong>solar</strong>.com.com)<br />
Developing people - creating value<br />
22.06.2011
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