Quartz crucible use process for meeting pulling of multiple single crystals

Abstract

The invention provides a quartz crucible use process for meeting pulling of multiple single crystals. In a section refeeding process of pulling of single crystals, a certain amount of aluminum hydroxide is added; and in addition, along with increase of the number of pulled single crystals, the aluminum hydroxide is replenished to replenish dropped crystal evolution layers, and a quartz crucible istransformed into a stable alpha-cristobalite structure. The process has the beneficial effects that due to addition of the aluminum hydroxide, transformation of the quartz crucible to the stable alpha-cristobalite structure is accelerated, the dropped crystal evolution layers can be replenished, corrosion of a silicon solution to the quartz crucible can be reduced, the service life of the quartzcrucible can be prolonged, and cost reduction and effect improvement can be achieved.

Description

technical field [0001] The invention belongs to the field of photovoltaic technology, and in particular relates to a process for using a quartz crucible capable of pulling multiple single crystals. Background technique [0002] The existing quartz crucibles for silicon single crystals generally can only pull 2-3 single crystals, which cannot meet the requirements for continued use of the single crystals. [0003] Due to the high chemical activity of silicon in the molten state, it will react with the quartz crucible, that is, SiO2+Si→2SiO, which will cause irreversible damage to the transparent layer of the quartz crucible and affect the service life of the quartz crucible. [0004] In the prior art, barium carbonate aqueous solution is sprayed on the inner wall of the crucible to speed up the crystallization of the crucible. The crystallization of the crucible is serious in the later stage of operation of this method, and the cristobalite on the inner wall will fall off, ma...

AI Technical Summary

Problems solved by technology

[0002] The existing quartz crucibles for silicon single crystals generally can only pull 2-3 single crystals, which cannot meet the requirements for continued use of single crystals

[0003] Due to the high chemical activity of silicon in the molten state, it will react with the quartz crucible, that is, SiO2+Si→2SiO, which will cause irreversible damage to the transparent layer of the quartz crucible and affect the service life of the quartz crucible.

[0004] In the prior art, barium carbonate aqueous solution is sprayed on the inner wall of the crucible to speed up the crystallization of the crucible. In the later stage of this method, the crystallization of the crucible is serious, and the cristobalite on the inner wall will fall off, resulting in difficulty in crystallization of silicon single crystals, and it is impossible to pull multiple single crystals.

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