Preparation method for quartz crucible with high-efficiency coating

A production method and quartz crucible technology are applied in the field of production of high-efficiency coated quartz crucibles, which can solve the problems of high cost, large ingot removal, low yield, etc., and achieve photoelectric conversion efficiency improvement, dislocation defect improvement, and reduction in The effect of product production costs

Inactive Publication Date: 2017-07-28
杭州大和江东新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the full melting process, the semi-melting process is because a layer of seed particles is laid on the inner bottom of the crucible to induce crystal growth, so the average photoelectr

Method used

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  • Preparation method for quartz crucible with high-efficiency coating

Examples

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Embodiment approach

[0026] A method for manufacturing an efficient coated quartz crucible, comprising the following steps:

[0027] (1) Select ultra-high-purity quartz sand with a particle size of 0.2mm-0.6mm (purity ≥ 99.9999%), add deionized water with a weight of 10%-40% of the ultra-high-purity quartz sand, and put it into a ball mill for ball milling to make a slurry , the slurry particle size is 6μ-15μm.

[0028] (2) The slurry, deionized water, silica sol and organic ceramic binder prepared in step (1) are mixed according to the weight ratio (5-15): 1: (3-10): (3-15) Mix and stir thoroughly for 0.5-2 hours to make high-efficiency slurry. The organic ceramic binder is selected from one or more of carboxymethyl cellulose, polypropylene and polyethylene.

[0029] (3) Coat the high-efficiency slurry prepared in step (2) on the inner bottom surface of the square quartz crucible, and the coating thickness is 0.1mm-2mm.

[0030] (4) Spread 50g-250g ultra-high-purity quartz sand (purity ≥ 99.99...

specific preparation example 1

[0033] A method for manufacturing an efficient coated quartz crucible, comprising the following steps:

[0034] (1) 10kg of ultra-high-purity quartz sand (purity 99.9999%, its particle size by weight percentage: 20% greater than 500 μm, 50% of 300 μm-500 μm, 30% less than 300 μm) 10kg, add 2kg of deionized Put water into a ball mill barrel with a capacity of 20 L, and ball mill for 5 hours, and the particle size of the slurry after ball milling is in the range of 6 μ-15 μm.

[0035] (2) Mix 300g of the slurry prepared in step (1), 30g of deionized water, 100g of silica sol (commercially available, with a solid content of 25%) and 150g of polypropylene, and stir thoroughly for 2 hours to make a high-efficiency slurry.

[0036] (3) Spray the high-efficiency slurry prepared in step (2) on the inner bottom surface of the square quartz crucible, and the coating thickness is 0.1 mm.

[0037](4) 100g of ultra-high-purity quartz sand (purity 99.9999%, composed of the following partic...

specific preparation example 2

[0039] A method for manufacturing an efficient coated quartz crucible, comprising the following steps:

[0040] (1) 10kg of ultra-high-purity quartz sand (purity 99.9999%, its particle size by weight percentage: 10% greater than 500 μm, 70% of 300 μm-500 μm, 20% less than 300 μm) 10kg, add 2kg of deionized Put water into a ball mill barrel with a capacity of 20 L, and ball mill for 3.5 hours. The particle size of the slurry after ball milling is in the range of 6 μ-15 μm.

[0041] (2) Mix 150g of the slurry prepared in step (1), 30g of deionized water, 300g of silica sol (commercially available, with a solid content of 25%) and 450g of polypropylene, and stir thoroughly for 1 hour to make a high-efficiency slurry.

[0042] (3) Spray the high-efficiency slurry prepared in step (2) on the inner bottom surface of the square quartz crucible, and the coating thickness is 2 mm.

[0043] (4) 250g of ultra-high-purity quartz sand (purity 99.9999%, composed of the following particles ...

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Abstract

The invention discloses a preparation method for a quartz crucible with a high-efficiency coating. According to the preparation method, ultra-pure quartz sand is used as a raw material and undergoes ball milling and batch mixing under stirring so as to prepare slurry; the slurry is allowed to cover the inner bottom surface of the square quartz crucible by using a spraying or brush coating process; and then ultra-pure quartz sand or ultra-pure polysilicon particles are uniformly spread so as to prepare the high-efficiency coating. Thus, in the process of polysilicon ingot casting, crystal growth of an ingot is induced; dislocation defects are overcome; the photoelectric conversion efficiency of the ingot is improved; and cost for the ingot is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing a quartz crucible, in particular to a method for manufacturing a high-efficiency coated quartz crucible. Background technique [0002] At present, cast polycrystalline silicon solar cells have replaced Czochralski monocrystalline silicon as the most important photovoltaic material. However, the conversion efficiency of cast polycrystalline silicon solar cells is slightly lower than that of Czochralski monocrystalline silicon solar cells, and various defects in materials, such as grain boundaries, dislocations, micro-defects, and impurities in carbon and oxygen in materials, as well as contamination in the process The transition group metals are considered to be the key reason for the low conversion efficiency of the battery. Therefore, the research on the defects and impurities in the cast polysilicon, as well as the use of suitable gettering and passivation processes in the process are the key to fur...

Claims

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Application Information

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IPC IPC(8): C03C17/23
CPCC03C17/23
Inventor 周勇李卫川上泉寺西久広占克文
Owner 杭州大和江东新材料科技有限公司
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