Process method for prolonging service life of quartz crucible of silicon single crystal

Abstract

The invention provides a process method for prolonging the service life of a quartz crucible of a silicon single crystal. In a loading process of pulling of crystal, a certain amount of aluminum hydroxide is added, and then the quartz crucible is promoted to transform into an alpha-cristobalite structure. The method has the beneficial effects that the aluminum oxide is added, transformation of thequartz crucible to the stable alpha-cristobalite structure is accelerated, dropped crystallization layers can be replenished, corrosion of a silicon solution to the quartz crucible is reduced, the service life of the quartz crucible can be prolonged, and the purpose of reducing the cost and improving effects can be achieved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a process method for improving the service life of a quartz crucible for silicon single crystals. Background technique [0002] The existing quartz crucibles for silicon single crystals generally can only pull 2-3 single crystals, and the service life is short, 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. In the later stage of operation of this method, the crystallization of the crucible is serious, and the c...

AI Technical Summary

Problems solved by technology

[0002] The existing quartz crucibles for silicon single crystals generally can only pull 2-3 single crystals, and the service life is short, 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, resulting in difficulty in crystallization of silicon single crystal and short service life, which cannot meet the needs of use.

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