Preparation method of quartz crucible coating

Abstract

The invention provides a method for preparing a quartz crucible coating. The method comprises the following steps of: (a) preparing a barium hydroxide solution, wherein the weight ratio of barium hydroxide to water in the barium hydroxide solution is 1:(46-52); and (b) heating a quartz crucible till the temperature is above 200 DEG C, uniformly spraying the barium hydroxide solution on the inner wall and the upper opening of the quartz crucible, and forming a barium hydroxide coating on the inner wall and the upper opening of the quartz crucible after spraying. According to the method, the barium hydroxide formed on the surface of the crucible is reacted with carbon dioxide in air to form barium carbonate; when the quartz crucible is heated on a mono-crystal furnace, the barium carbonate is decomposed into barium oxide; the barium oxide is reacted with the quartz crucible to form barium metasilicate; a barium metasilicate layer can be used for protecting the quartz crucible; mono-crystal silicon can be prevented from reacting with the quartz crucible in a high-temperature drawing process; the service life and the long crystal yield of the quartz crucible are improved; furthermore,the intensity of the quartz crucible can also be increased; and the high-temperature softening phenomenon is reduced.

Description

Technical field [0001] The invention relates to the field of photovoltaic module manufacturing, in particular to a method for preparing a quartz crucible coating. Background technique [0002] With the progress of industrialization, conventional energy sources such as coal, oil, and natural gas are increasingly depleted, and a series of environmental protection problems have also emerged. Therefore, traditional petrochemical energy has been unable to meet the needs of modern industry, and the environmental problems it generates have also posed a threat to the environment for people's living. As a renewable green energy, solar energy has gradually developed rapidly all over the world. With the increasing maturity of solar power generation technology, solar cells have been widely used in many fields such as industry, agriculture and aerospace. [0003] Solar cells are devices that convert light energy into electrical energy through photoelectric effect or photochemical effect. At ...

AI Technical Summary

Problems solved by technology

However, severe crystallization has a great impact on pulling single crystals. When crystallization occurs on the inner wall of the quartz crucible, the original coating on the inner wall of the crucible may be damaged, which will cause the bubble layer under the coating to react with the molten silicon, causing some Granular silicon oxide enters the molten silicon, which makes the growing crystal structure change and cannot grow normally.

In addition, crystallization will reduce the original thickness of the quartz crucible, reducing the strength of the crucible and easily causing the deformation of the quartz crucible

[0005] In recent years, with the increase of the feeding amount, the crystal pulling time has also been extended accordingly, and the crystallization of the existing quartz crucible has become more and more serious, resulting in the fact that the service life of the quartz crucible cannot meet the existing time requirements during crystal pulling. And lead to the occurrence of material leakage; and if the surface of the quartz crucible is accompanied by extremely small impurities, it will also cause the single crystal to break during the growth process, affecting the yield

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