A kind of high-purity coated polysilicon crucible and its coating method

Abstract

The invention relates to a high-purity coating type polycrystalline silicon crucible and a brushing method of a coating of the high-purity coating type polycrystalline silicon crucible. The high-purity coating type polycrystalline silicon crucible comprises a crucible body, wherein a plurality of pit or annular grooves are uniformly formed in the surface of the crucible body, and the surface of the crucible body is sequentially adhered with a first nitration layer, a second oxidization layer and a third nitration layer; the surface of the crucible body is brushed with the whey-state first nitration layer, powdery silicon oxide of the second oxidization layer is ejected to the surface of whey, vaporous silicon nitride is sprayed to the surface of the second oxidization layer until particles of the second oxidization layer are covered, and a smooth surface is formed on the third nitration layer. The high-purity coating type polycrystalline silicon crucible and the brushing method have the characteristics that the coating is strong in covering capacity and high in stability and isolation degree, and the crucible body is prevented from reacting during the preparation of polycrystalline silicon.

Description

technical field [0001] The invention relates to the technical field of solar cell production equipment, in particular to a high-purity coated polysilicon crucible and a coating method thereof. Background technique [0002] As we all know, the power supply in the world is becoming increasingly tense, and the application of photovoltaic technology can effectively alleviate this situation. Photovoltaic power generation mainly includes single crystal and polycrystalline cell technology. Compared with single crystal, polycrystalline photovoltaic has the advantages of low energy consumption and high efficiency; 6 to 7 times of that, so polycrystalline has been widely used in recent years. [0003] In recent years, with the increasing maturity of solar power generation technology, solar cells have been widely used in many fields such as industry, agriculture and aerospace. At present, according to the different materials used, solar cells can be divided into: silicon solar cells,...

AI Technical Summary

Problems solved by technology

However, dense silicon nitride materials must be sintered in the liquid phase under nitrogen protection atmosphere and high temperature environment, and usually the size of dense silicon nitride materials after sintering shrinks by more than 10% compared with that before sintering, so the silicon nitride layer coated on the surface of the quartz crucible It is difficult to achieve high density and cannot meet production requirements

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