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Quartz ceramic crucible for producing high-efficiency polycrystals and preparation method thereof

A technology of quartz ceramics and crucibles, which is applied in glass production, glass manufacturing equipment, chemical instruments and methods, etc., can solve problems such as defects, reduce high aluminum content, and poor thermal performance of crucibles, so as to improve thermal performance and reduce aluminum content, the effect of reducing the content of impurities

Active Publication Date: 2012-12-19
CHANGSHU JIAHE DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problems to be solved by the present invention are: one, to reduce the high surface impurities in the traditional quartz ceramic crucible; The high aluminum content brought in; three, the thermal performance of the traditional quartz ceramic crucible is not good; four, there are usually tiny closed bubbles in the existing crucible, these bubbles burst and overflow under the high temperature state of the polycrystalline ingot casting furnace, and the overflowing impurities Components will enter the dissolved silicon material, causing defects in the silicon crystal growth process

Method used

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  • Quartz ceramic crucible for producing high-efficiency polycrystals and preparation method thereof
  • Quartz ceramic crucible for producing high-efficiency polycrystals and preparation method thereof
  • Quartz ceramic crucible for producing high-efficiency polycrystals and preparation method thereof

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specific Embodiment 1

[0027] Put 1 part of ultrafine quartz powder less than 1 micron with a purity of 99.991%, 3 parts of quartz powder from 1 micron to 200 microns, and 1 part of quartz aggregate from 200 microns to 1000 microns into a high-shear mixer Mix well, then add 6 parts water and mix for 1 hour. The inner surface of the quartz ceramic crucible was coated by dip coating, and after dip coating, the crucible was put into a drying oven and dried at 80° C. for 5 hours to obtain a quartz ceramic crucible for producing high-efficiency polycrystals.

[0028] get as figure 1 The shown quartz ceramic crucible for producing high-efficiency polycrystals includes a crucible body. The crucible body is an opaque quartz ceramic crucible. The inner surface of the crucible body contains a high-purity quartz ceramic inner layer with a thickness of 800 microns.

specific Embodiment 2

[0029] Put 2 parts of ultrafine quartz powder less than 1 micron with a purity of 99.993%, 1 part of quartz powder from 1 micron to 200 microns, and 1 part of quartz aggregate from 200 microns to 1000 microns into a high-shear mixer Mix well, then add 6 parts of water and mix for 0.5 hours. Spraying is carried out on the inner surface of the quartz ceramic crucible by means of spraying. After spraying, the crucible is placed in a drying oven and dried at 150° C. for 2 hours to obtain a quartz ceramic crucible for producing high-efficiency polycrystalline. like figure 2 The shown quartz ceramic crucible for producing high-efficiency polycrystals includes a crucible body, the crucible body is an opaque quartz ceramic crucible, and contains a high-purity quartz ceramic inner layer at the bottom of the inner surface of the crucible body, and the thickness of the inner layer is 10 microns.

specific Embodiment 3

[0030] Put 4 parts of 200 micron-1000 micron quartz material with a purity of 99.99% into a wet ball mill, add 3 parts of water, ball mill for 8 hours, and the particle size of the slurry reaches 0.8-50 microns. Then add 1 part of 200 micron-1000 micron aggregate, mix for 1 hour, then put 1 part of 200 micron-1000 micron quartz aggregate with a purity of 99.99% into a high-shear mixer and mix evenly, and then put it into 6 part water, mix for 1.5 hours. The inner surface of the quartz ceramic crucible was coated by brushing. After brushing, the crucible was put into a drying oven and dried at 80° C. for 5 hours to obtain a quartz ceramic crucible for producing high-efficiency polycrystalline.

[0031] The quartz ceramic crucible for producing high-efficiency polycrystalline, including a crucible body, the crucible body is an opaque quartz ceramic crucible, the inner surface of the crucible body contains a high-purity quartz ceramic inner layer, and the thickness of the inner l...

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Abstract

The invention discloses a quartz ceramic crucible for producing high-efficiency polycrystals, which comprises a crucible body, wherein the crucible body is a quartz ceramic crucible; and the internal surface of the crucible body comprises a high-purity quartz ceramic inner layer. The invention overcomes the following defects in the traditional quartz ceramic crucible: the traditional quartz ceramic crucible has high impurities, thereby influencing the electric properties of the downstream battery cells; high-content aluminum can be introduced into the crucible in the traditional ceramic production technique, thereby influencing the resistivity of the silicon wafer; and the traditional quartz ceramic crucible has poor thermal properties. The invention can lower the impurity content and aluminum content in the quartz ceramic crucible, and enhance the thermal properties of the quartz ceramic crucible, so that the quartz ceramic crucible can well satisfy the demands for real production.

Description

technical field [0001] The invention relates to a crucible, in particular to a high-purity quartz ceramic crucible for producing high-efficiency polysilicon ingots. Background technique [0002] At present, silicon cells occupy most of the photovoltaic market. In crystalline silicon solar cells, polycrystalline silicon occupies 80% of the entire photovoltaic industry due to its simpler manufacturing process and lower manufacturing cost than monocrystalline silicon. [0003] The polysilicon ingot casting process mainly includes directional solidification method and casting method, and both of these methods require quartz crucibles for ingot casting. Traditional quartz crucibles mainly have the following problems: [0004] One is that the traditional quartz ceramic crucible has high impurities, which will form deep energy levels in silicon, and the deep energy levels are far away from the conduction band and forbidden band, so the energy level of the impurities themselves has...

Claims

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Application Information

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IPC IPC(8): C03B20/00C30B15/10
CPCC03B19/095Y02P40/57
Inventor 张福军张伏严周佳晖
Owner CHANGSHU JIAHE DISPLAY TECH CO LTD
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