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Application of silica powder to polycrystalline silicon cast ingot preparation

A technology for polycrystalline silicon and polycrystalline silicon blocks, which is applied in the directions of polycrystalline material growth, crystal growth, single crystal growth, etc., can solve the problems of inability to bring economic benefits, low product life of minority carriers, insufficient silicon powder melting material, etc. The effect of reducing the amount of furnace, reducing the preparation cost, and improving the lifetime of the minority carrier

Active Publication Date: 2019-05-28
无锡坤硅新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the use of silicon powder in the photovoltaic ingot industry is to fill the gaps of bulk silicon materials and increase the furnace capacity, but this results in insufficient melting of silicon powder, low yield of silicon ingots, and low product life. Too low to meet current market demand
[0004] In order to eliminate this deficiency, the conventional method is nothing more than pressing the silicon powder into a powder cake, purifying the first ingot, removing the head and tail impurities, and then going through the second ingot casting, which greatly increases the input cost and cannot bring higher cost. economic benefits

Method used

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  • Application of silica powder to polycrystalline silicon cast ingot preparation
  • Application of silica powder to polycrystalline silicon cast ingot preparation
  • Application of silica powder to polycrystalline silicon cast ingot preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The method of the present embodiment comprises the following steps:

[0038] Step 1. Loading: Put 50kg of silicon powder, 170kg of silicon regrind, 150kg of silicon granules, 250kg of polysilicon blocks, 180kg of polysilicon rods, and 50kg of silicon seeds into the quartz crucible of the ingot furnace as silicon for ingot casting. material;

[0039] The mass purity of the silicon powder is 99.9999%, and the particle size is 0.02mm to 0.149mm. The mass purity of the silicon particles is 99.9999999%, and the particle size is greater than 1mm. The mass purity of the polycrystalline silicon block and polycrystalline silicon bar is both 99.9999999%, the particle size of the silicon seed crystal is 1 mm to 4 mm; the loading method of the silicon material in the quartz crucible is as follows: the silicon seed crystal is first loaded into the bottom layer of the quartz crucible until its thickness is 15 mm, and then along the parallel Adhere to the inner wall of the quartz cru...

Embodiment 2

[0065] The difference between this embodiment and Example 1 is that in the charging process of step 1, 170kg of silicon regrind, 150kg of silicon powder, 150kg of silicon granules, 150kg of polysilicon blocks, 180kg of polysilicon rods, and 50kg of silicon seeds are loaded Put it into the quartz crucible of the ingot furnace as the silicon material for ingot casting; the time of the sixth fast melting described in step 301 is 330 minutes, and the heating temperature of the seventh fast melting and the eighth fast melting are both 1540°C.

Embodiment 3

[0067] The difference between this embodiment and Embodiment 1 is that in the charging process of step 1, 170kg of silicon regrind, 250kg of silicon powder, 150kg of silicon granules, 50kg of polysilicon blocks, 180kg of polysilicon rods, and 50kg of silicon seed crystals are packed Put it into the quartz crucible of the ingot furnace as the silicon material for ingot casting; the time of the sixth fast melting described in step 301 is 360min, and the heating temperatures of the seventh fast melting and the eighth fast melting are both 1530°C; The heating temperatures of the first slow melting and the second slow melting in step 302 are both 1525°C.

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Abstract

The invention discloses application of silica powder to polycrystalline silicon cast ingot preparation. A preparation method of the polycrystalline silicon cast ingot comprises the following steps: step 1, the silica powder, silicon reuse materials, silica particles, polycrystalline silicon block materials, polycrystalline silicon bar materials, and silicon seed crystal are fed in the quartz crucible of an ingot furnace to serve as silicon materials used for the cast ingot; step 2, the ingot furnace is subjected to vacuum pumping and heating; step 3, the silicon materials used for the cast ingot are melted; step 4, argon is introduced to the ingot furnace, and pressure maintaining and cooling are performed for controlled directional solidification crystal growth; step 5, the argon is continuously introduced to the ingot furnace to perform anneal, and step 6, the argon is continuously introduced to the ingot furnace to cool to obtain the polycrystalline silicon cast ingot. According tothe application of silica powder to polycrystalline silicon cast ingot preparation, the silica powder is taken as one of the preparing silicon materials for the polycrystalline silicon cast ingot, unique charging mode is adopted, the charge batch of the silicon materials and the silica powder is effectively increased, the heat transfer effect among silicon materials is improved, sufficient meltingof the silica powder is guaranteed, rate of finished products of the polycrystalline silicon cast ingot is improved, thereby the minority carrier lifetime of the polycrystalline silicon is improved,and meanwhile, the silica powder need not to be pressed into a powder cake in advance, thereby lowering the preparation cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of polycrystalline silicon ingots, and in particular relates to the application of silicon powder in the preparation of polycrystalline silicon ingots. Background technique [0002] Polysilicon powder is an essential raw material for the photovoltaic ingot casting industry. It has superior furnace loading advantages, which can increase the furnace loading and improve the yield of products. [0003] At present, most of the use of silicon powder in the photovoltaic ingot industry is to fill the gaps of bulk silicon materials and increase the furnace capacity, but this results in insufficient melting of silicon powder, low yield of silicon ingots, and low product life. Low, unable to meet the current market demand. [0004] In order to eliminate this deficiency, the conventional method is nothing more than pressing the silicon powder into a powder cake, purifying the first ingot, removing the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/06C30B29/06
Inventor 李建军史燕凯吴增伟
Owner 无锡坤硅新能源科技有限公司
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