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A kind of efficient crucible and preparation method thereof

A crucible and high-efficiency technology, applied in the field of polycrystalline silicon solar cells, can solve the problems of affecting the effect of sticking to the pot, affecting the effect of seeding at the bottom of the silicon ingot, affecting the roughness of the bottom of the crucible, etc. The effect of improved conversion efficiency

Active Publication Date: 2022-03-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the solar polysilicon ingot casting process, the crucible spraying process used is silicon nitride material as the spraying material. Using silicon nitride can effectively isolate the reaction between the silicon material and the crucible and prevent the pot from sticking, but in In the process of using high-efficiency crucible for high-efficiency polycrystalline production, spraying silicon nitride coating on the bottom of the crucible will often affect the roughness of the bottom of the crucible and affect the seeding effect on the bottom of the silicon ingot; and if the coating is sprayed fluffy, it will be Affects the sticking effect of the inner surface of the crucible side wall

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The present application also provides a method for preparing a high-efficiency crucible, which uses a spray gun to spray silicon nitride slurry on the inner surface of the high-efficiency crucible, sprays the first silicon nitride slurry on the inner surface of the bottom of the crucible body, and sprays the first silicon nitride slurry on the inner surface of the crucible body. The inner surface of the body side wall is sprayed with a second silicon nitride slurry, the first silicon nitride slurry includes first silicon nitride particles, and the second silicon nitride coating includes second silicon nitride particles; wherein, 2 μm ≤ the median diameter D50 of the first silicon nitride particles ≤ 3.5 μm, 1 μm ≤ the median diameter D50 of the second silicon nitride particles < 2 μm.

[0019] In the present invention, the spray gun is commonly used equipment in this field, such as Xiamen Sirte IRB1400 robot spray gun. The flow rate of the sprayed slurry will affect the...

Embodiment 1

[0031] In this example, the crucibles are commercially available Huarong silicon granule high-efficiency high-purity crucibles, solar silicon granule high-efficiency high-purity crucibles, and the silicon nitride powder is commercially available medium-one silicon nitride and homolithic silicon nitride, and silica sol For Ushiko.

[0032] Dissolve 260g of the first silicon nitride particles (median particle diameter D50 is 2 μm) and 140ml of silica sol in 500ml of deionized water, and mix uniformly to prepare the first silicon nitride slurry; 510g of the second silicon nitride particles ( Dissolve 270ml of silica sol in 1000ml of deionized water and mix well to prepare the second silicon nitride slurry. The model of the robot spray gun is Xiamen Sirte IRB1400.

[0033] When spraying, the parameters of the bottom and side of the crucible are set separately. When spraying the bottom, the temperature of the bottom of the crucible is set to 90°C, the atomization pressure of the spr...

Embodiment 2

[0035] In this example, the crucibles are commercially available Huarong quartz sand high-efficiency high-purity crucibles, Huarong silicon granule high-efficiency high-purity crucibles, and solar silicon granule high-efficiency high-purity crucibles, and the silicon nitride powder is commercially available medium-one silicon nitride , Tongli silicon nitride, and silica sol are Ushiko.

[0036] Dissolve 300g of the first silicon nitride particles (median particle diameter D50 is 2.5 μm) and 150ml of silica sol in 500ml of deionized water, and mix uniformly to prepare the first silicon nitride slurry; 550g of the second silicon nitride particles (median particle diameter D50 is 1.2 μm), 300 ml of silica sol was dissolved in 1200 ml of deionized water and mixed to prepare the second silicon nitride slurry. The model of the robot spray gun is Xiamen Sirte IRB1400.

[0037] When spraying, the parameters of the bottom and side of the crucible are set separately. When spraying the ...

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Abstract

The invention relates to a high-efficiency crucible and a preparation method thereof. The high-efficiency crucible includes a crucible body, a first silicon nitride coating disposed on the inner surface of the bottom of the crucible body, and a second silicon nitride coating disposed on the inner surface of the side wall of the crucible body; the first silicon nitride coating The coating layer includes first silicon nitride particles, and the second silicon nitride coating layer includes second silicon nitride particles; wherein, 2μm≦the median diameter of the first silicon nitride particles D50≦3.5μm, and 1μm≦the second nitrogen The median diameter D50 of the silicon carbide particles is less than 2 μm. The median diameter D50 of the silicon nitride particles in the first silicon nitride coating is larger, which can make the coating at the bottom of the crucible body fluffy and improve the seeding effect of the silicon ingot; the nitrogen in the second silicon nitride coating The median particle size D50 of the silicon carbide particles is small, which can make the coating on the side of the crucible body more dense, reduce the silicon ingot sticking rate on the inner surface of the crucible side wall, and thus improve the photoelectric conversion efficiency.

Description

technical field [0001] The present application relates to the technical field of polysilicon solar cells, in particular to a high-efficiency crucible and a preparation method thereof. Background technique [0002] With the rapid development of the solar cell industry, compared with monocrystalline silicon, polycrystalline silicon is more and more favored by the industry because of its simple manufacturing process, low cost and suitable for large-scale production. At present, when actually producing solar polysilicon ingots, it is necessary to use a quartz crucible to fill the silicon material. It is called directional solidification crystallization), annealing, cooling and other steps to complete the polysilicon ingot casting process. At present, in the solar polysilicon ingot casting process, the crucible spraying process used is silicon nitride material as the spraying material. Using silicon nitride can effectively isolate the reaction between the silicon material and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B28/06C30B29/06B05D7/22
CPCC30B28/06C30B29/06B05D7/22
Inventor 范波波梁万松赵卫陈袆蔡保山
Owner BYD CO LTD