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A method for spraying silicon nitride on the inner surface of a high-efficiency crucible

An inner surface, silicon nitride powder technology, applied in the field of polycrystalline silicon solar cells, can solve the problems of insufficient roughness of the bottom of the crucible, adverse effects of the crystal growth process, etc., and achieve the effect of avoiding cold shock

Active Publication Date: 2017-01-25
YANGZHOU RONGDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that silicon nitride coating spraying on the high-efficiency crucible in the prior art will lead to insufficient roughness of the bottom of the crucible, and the temperature change rate that needs to be suddenly increased in the early stage of crystal growth will affect the subsequent crystal growth process. Disadvantages that cause adverse effects, providing a method for spraying silicon nitride on the inner surface of a high-efficiency crucible

Method used

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  • A method for spraying silicon nitride on the inner surface of a high-efficiency crucible
  • A method for spraying silicon nitride on the inner surface of a high-efficiency crucible
  • A method for spraying silicon nitride on the inner surface of a high-efficiency crucible

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Effect test

Embodiment 1

[0031] Embodiment 1: the preparation of silicon nitride slurry

[0032] Silicon nitride powder, silica sol and water are prepared according to the weight ratio of 3:2:7, the silica sol is first added to the water and stirred for five minutes, and then the silicon nitride powder is added and stirred for 30-40 minutes to prepare nitrogen Silicate slurry.

[0033] Wherein, the β phase content of the silicon nitride powder is 70%, the D50 value is 2 μm, and the particle size distribution is a bimodal distribution.

Embodiment 2

[0034] Embodiment 2: Spraying of silicon nitride in a high-efficiency crucible

[0035] When spraying, the bottom and side of the crucible are controlled separately. The inner temperature control of the bottom of the crucible was set at 90°C, and the temperature of the inner side wall of the crucible was set at 130°C. Such as figure 1 , 2 As shown, adjust the atomization knob on the spray gun, increase the pressure knob to a pressure of 50psi, and the spray gun spray pattern reaches a width of 15cm to spray the inner surface of the bottom of the crucible; adjust the spray gun pressure knob, reduce the pressure to a pressure of 20psi, the spray pattern When the width is reduced to 8cm, the inner surface of the crucible side wall is sprayed. During the spraying process, it is necessary to adjust the flow rate of silicon nitride powder slurry flowing into the spray gun through the peristaltic pump flow control knob at the same time. The peristaltic pump speed is 100rpm when spra...

Embodiment 3

[0037] Embodiment 3: Spraying of silicon nitride in high-efficiency crucible

[0038] When spraying, the bottom and side of the crucible are controlled separately. The temperature control at the bottom of the crucible was set at 110°C, and the temperature at the side wall of the crucible was set at 150°C. Such as figure 1 , 2 As shown, adjust the atomization knob on the spray gun, increase the pressure knob to a pressure of 60psi, and the spray gun spray pattern reaches a width of 20cm to spray the inner surface of the bottom of the crucible; adjust the spray gun pressure knob, reduce the pressure to a pressure of 30psi, and the spray pattern When the width is reduced to 12cm, the inner surface of the crucible side wall is sprayed. During the spraying process, it is necessary to adjust the flow rate of the silicon nitride powder slurry flowing into the spray gun through the peristaltic pump flow control knob at the same time. The peristaltic pump speed is 150rpm when sprayi...

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Abstract

The invention discloses a method of spraying silicon nitride on the inner surface of an efficient crucible. According to the method, a spray gun connected with a peristaltic pump is adopted for spraying silicon nitride serous fluid on the inner surface of the efficient crucible, wherein the spraying pressure to the inner surface of the side wall of the efficient crucible is 20-30psi, the rotary speed of the peristaltic pump is 250-400rpm; the spraying pressure to the inner surface of the bottom of the efficient crucible is 50-60psi, the rotary speed of the peristaltic pump is 100-150rpm. The ingot casting operation is executed on the efficient crucible sprayed by the method and the ingot casting technology is not adjusted particularly, the ingot casting technology of the existing common polycrystalline silicon is adopted for obtaining the polycrystalline silicon ingot with high quality and even and small grain structure and the potential risk caused by the cold impact of the prior art at the adjustment time can be avoided.

Description

technical field [0001] The invention relates to the technical field of polycrystalline silicon solar cells, in particular to a method for spraying silicon nitride on the inner surface of a high-efficiency crucible. Background technique [0002] In recent years, with the depletion of non-renewable energy sources, solar cells have been developed rapidly. With the rapid development of the solar cell industry, polysilicon, which is low in cost and suitable for large-scale production, has gradually replaced Czochralski monocrystalline silicon in the solar cell material market and has become one of the most important photovoltaic materials in the industry. However, various defects in cast polycrystalline silicon, such as grain boundaries, dislocations, micro-defects, and impurity carbon and oxygen in the material, make the conversion efficiency of polycrystalline silicon cells lower than that of Czochralski monocrystalline silicon solar cells, which has become a limit to the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50C04B41/85
Inventor 常传波杨振帮袁聪冯琰
Owner YANGZHOU RONGDE NEW ENERGY TECH