Crucible bottom coating for full-melting efficient polycrystalline growth as well as spraying process and application of crucible bottom coating

A technology for crucible bottom and polycrystalline growth, which is applied in the field of high-efficiency polycrystalline crucible bottom coating and crucible bottom coating for full-melt high-efficiency polycrystalline growth. It is difficult to control, and the spraying cannot be guaranteed to be completely uniform, etc., to achieve the effect of high density, less impurities, and improved conversion efficiency

Inactive Publication Date: 2020-08-11
江苏美科太阳能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spraying cannot be guaranteed to be completely uniform, and there are also differences between the center and the edge of the thermal field of the ingot furnace. The nucleation and seeding effect at the bottom of the crucible under the full melting process is not completely uniform, resulting in a relatively narrow process window for good nucleation and seeding. This is the main factor for the high difficulty in controlling the key points of the full melting process

Method used

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  • Crucible bottom coating for full-melting efficient polycrystalline growth as well as spraying process and application of crucible bottom coating
  • Crucible bottom coating for full-melting efficient polycrystalline growth as well as spraying process and application of crucible bottom coating

Examples

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Embodiment 1

[0028] This embodiment provides a crucible bottom coating for full-melt high-efficiency polycrystalline growth, with a structure such as figure 2 As shown, the coating is covered on the bottom surface of the crucible, the crucible base 1 is provided with quartz sand particles 2, the quartz sand particles 2 are provided with a slurry A coating 3 and a slurry B coating 4, and a slurry B coating 4 On slurry A coat 3 where:

[0029] Slurry A coating is made by spraying slurry A. Slurry A is a mixture of silicon nitride powder, ultrapure water and silica sol. According to the mass ratio, silicon nitride powder: ultrapure water: silica sol=2.5-3 :8-10:1;

[0030] Slurry B coating is made by spraying slurry B. Slurry B is a mixture of silicon nitride powder, ultrapure water, silica sol and mixed powder α. According to the mass ratio, silicon nitride powder: ultrapure water: silica sol : The mass ratio of the mixed powder α is 2.5-3:8-10:1:0.3-0.5, and the mixed powder α is made by...

Embodiment 2

[0034] This embodiment provides the spraying process and application of the bottom coating of the crucible for full-melt high-efficiency polycrystalline growth in Example 1, which specifically includes the following steps:

[0035] (1) Preparation of Slurry A and Slurry B, take a measuring cup and add 540g of ultrapure water and 60g of silica sol and stir, add 150g of silicon nitride powder while stirring, stir for 20-30 minutes and filter to obtain Slurry A For coating slurry A, take another measuring cup and add 360g of ultrapure water and 40g of silica sol and stir, add 100g of silicon nitride powder while stirring, stir for 20-30 minutes and filter, then add 16g of silicon powder of 200 mesh and 0.8 g silicon dioxide powder obtains the slurry B of slurry B coating, for subsequent use;

[0036] (2) Set the atomization pressure of the spray gun to 4.0kgf / cm², and the atomization pressure to 4.2kgf / cm²;

[0037] (3) The starting point and end point of spraying are set on the...

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Abstract

The invention discloses a crucible bottom coating for full-melting efficient polycrystalline growth as well as a spraying process and application of the crucible bottom coating. The coating covers thesurface of the bottom of a crucible and comprises a slurry A coating and a slurry B coating. The slurry A coating is made of a mixture of silicon nitride powder, ultrapure water and silica sol, and the mass ratio of the silicon nitride powder to the ultrapure water to the silica sol is (2.5-3): (8-10): 1. The slurry B coating is made of a mixture of silicon nitride powder, ultrapure water, silicasol and mixed powder alpha, the mass ratio of the silicon nitride powder to the ultrapure water to the silica sol to the mixed powder alpha is (2.5-3): (8-10): 1: (0.3-0.5), and the mixed powder alpha is prepared by mixing silicon powder of 200-300 meshes and silicon dioxide powder. The coating material is high in purity and few in impurities, the formed coating is high in compactness and good inbarrier effect, and the spraying process is simple and easy to implement.

Description

technical field [0001] The invention relates to a high-efficiency polycrystalline crucible bottom coating technology, in particular to a crucible bottom coating for full-melt high-efficiency polycrystalline growth, which belongs to the field of photovoltaic ingot polycrystalline silicon growth. Background technique [0002] With the comprehensive promotion of diamond wire slicing and the large-scale application of new battery technologies such as PERC and HIT, the efficiency and cost of monocrystalline silicon wafers and polycrystalline silicon wafers are gradually increasing. Quality improvement is particularly important. [0003] At present, polycrystalline ingot casting technology is mainly divided into semi-melting process and full-melting process. Compared with semi-melting process, full-melting process has less head and tail truncation, high effective utilization rate, short ingot casting time, and low energy consumption per unit of water and electricity. Cost advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/61C30B28/06C30B29/06B05D1/02B05D3/02
CPCB05D1/02B05D3/0272C09D1/00C30B28/06C30B29/06C09D7/61
Inventor 严东王艺澄
Owner 江苏美科太阳能科技股份有限公司
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