Method for producing highly purified, granular silicium
AssigneeSolarworld Aktiengesellschaft
InventorsKarl-Ludwig Metzger, Leslaw Mleczko, Sigurd Buchholz, Philipp Schlichthärle
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Abstract
The invention relates to a method for producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, said decomposition occurring in the presence of free-flowing mobile elements. Preferably, said free-flowing mobile elements become devoid of silicon in a separate procedural step, said silicon being deposited during decomposition of gas containing silicon, by reacting with hydrogen halides, halogens, alkyl halogenides, aryl halogenides or combinations of halogen and/or hydrogen halide and/or oxidized mineral acids and/or by thermal treatment of said elements.
Claims21
A method for producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, wherein the said decomposition occurs in the presence of free-flowing, mobile elements, wherein silicon being deposited on such free-flowing mobile elements during decomposition of gas containing silicon is removed in a separate procedural step by reacting such silicon with at least one of hydrogen halides, halogens, alkyl halogenides, aryl halogenides and oxidizing mineral acids.
A method for granular producing silicon by thermal decomposition of a gas containing silicon in a fluidized bed, wherein the said decomposition occurs in the presence of free-flowing, mobile elements, wherein silicon being deposited on such free-flowing mobile elements during decomposition of gas containing silicon is removed in a separate procedural step by at least one of heating and cooling of such free-flowing mobile elements.
A method for producing one of photovoltaic and electronic components, the method comprising the steps of:
- producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, with the decomposition taking place in the presence of free flowing mobile elements;
- removing silicon deposited on the free-flowing mobile elements during decomposition of the gas containing silicon by at least one of heating the free-flowing mobile elements, cooling the free-flowing mobile elements, and reacting the silicon with at least one of hydrogen halides, halogens, alkyl halogenides, aryl halogenides and oxidizing mineral acids;
- manufacturing the one of photovoltaic and electronic components from the produced silicon.
Dependencies are inferred from the claim text.