Effective silicon production from SiCl₄ source using hydrogen radicals generated and transported at atmospheric...

In the Siemens method, high-purity Si is produced by reducing SiHCl₃ source gas with H₂ ambient under atmospheric pressure. Since the pyrolysis of SiHCl₃, which produces SiCl₄ as a byproduct, occurs dominantly in the practical Siemens process, the Si yield is low (~30%). In the present study, we generated hydrogen radicals (H-radicals) at pressures greater than 1 atm using tungsten filaments and transported the H-radicals into a reactor. On the basis of the absorbance at 600 nm of WO₃-glass exposed to H-radicals in the reactor, we observed that H-radicals with a density of ~1.1 × 10¹² cm^-3 were transported approximately 30 cm under 1 atm. When SiCl₄ was supplied as a source into the reactor containing H-radicals and allowed to react at 850°C or 900°C, Si was produced more efficiently than in reactions conducted under H₂ ambient. Because the H-radicals can effectively reduce SiCl₄, which is a byproduct in the Siemens method, their use is expected to increase the Si yield for this method.