Quartz crucible

Abstract

The invention relates to a quartz crucible for holding a silicon solution, wherein the wall of the quartz crucible is divided into an inner layer and an outer layer; the sum of the thickness of the inner layer and the thickness of the outer layer, namely the wall thickness of the quartz crucible, is essentially constant; the inner layer and the outer layer are made of quartz sand; the purity of quartz sand in the inner layer is higher than that of quartz sand in the outer layer; and the thickness of the inner layer in an expected stopping position of the liquid level of the silicon solution is increased, and the thickness of the outer layer in the expected stopping position of the liquid level of the silicon solution is correspondingly reduced. The invention solves the problems of low single crystal yield when the traditional quartz crucible is applied to generate silicon single crystals, and low production efficiency and higher cost due to the short service life of the traditional quartz crucible, and provides a quartz crucible with high silicon single crystal yield, high productivity and low production cost.

Description

technical field [0001] The invention relates to a single crystal production device. Specifically, it is a quartz crucible filled with silicon melt. Background technique [0002] In the Czochralski production process of electronic grade and solar grade silicon single crystal, the quartz crucible used for loading silicon melt is a key consumable. In the production process of single crystal, if low-purity quartz sand particles enter the silicon melt, when these quartz sand particles move to the solid-liquid interface of the silicon melt, it is very likely that the single crystal will become polycrystalline. Therefore, the quartz crucible used to load the silicon melt needs to be made of high-purity quartz sand. At present, only a few foreign companies monopolize the production of high-purity quartz sand raw materials. Not only is it expensive, but it is so rare that it is difficult to buy even if you have money. In order to reduce the use of high-purity quartz sand and reduc...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of low single crystal yield and low silicon single crystal production efficiency and high cost due to the short service life of the existing quartz crucible when the existing quartz crucible is used to generate silicon single crystal, and provides a Quartz crucible with high silicon single crystal single crystal yield, high productivity, and low production cost

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