Studies of the Induction Phase of the Hydrochlorination of Metallurgical Silicon

Демин, А. К.; Montsch, Thomas; Klemm, Elias

doi:10.1002/cite.201100069

Cited by 2 publications

(1 citation statement)

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“…The reactions during the synthesis change due to the changing types of impurities and do not correlate with mass silicon analysis. Studying the so-called inductive phase during the direct synthesis process [34] the authors concluded that hydrogen chloride adsorption on the silicon surface is accompanied by chlorine diffusion into the bulk phase. Therefore along with the chemical composition of metallurgical grade silicon one should take into account the distribution of intermetallic phases in silicon, the presence of slag inclusions and pores and the distribution of crystalline grains [35].…”

Section: Effect Of Silicon Impurity Compositionmentioning

confidence: 99%

Methods of trichlorosilane synthesis for polycrystalline silicon production. Part 1: Direct synthesis

Jarkin¹,

Kisarin²,

Kritskaya³

2021

MoEM

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Novel technical solutions and ideas for increasing the yield of solar and semiconductor grade polycrystalline silicon processes have been analyzed. The predominant polycrystalline silicon technology is currently still the Siemens process including the conversion of technical grade silicon (synthesized by carbon-thermal reduction of quartzites) to trichlorosilane followed by rectification and hydrogen reduction. The cost of product silicon can be cut down by reducing the trichlorosilane synthesis costs through process and equipment improvement. Advantages, drawbacks and production cost reduction methods have been considered with respect to four common trichlorosilane synthesis processes: hydrogen chloride exposure of technical grade silicon (direct chlorination, DC), homogeneous hydration of tetrachlorosilane (conversion), tetrachlorosilane and hydrogen exposure of silicon (hydro chlorination silicon, HC), and catalyzed tetrachlorosilane and dichlorosilane reaction (redistribution of anti-disproportioning reaction). These processes remain in use and are permanently improved. Catalytic processes play an important role on silicon surface, and understanding their mechanisms can help find novel applications and obtain new results. It has been noted that indispensable components of various equipment and process designs are recycling steps and combined processes including active distillation. They provide for the most complete utilization of raw trichlorosilane, increase the process yield and cut down silicon cost.

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Section: Effect Of Silicon Impurity Compositionmentioning

confidence: 99%