Quartz crucible capable of controlling nucleation and impurity diffusion and used for polycrystal cast ingot and preparation method of quartz crucible

A technology of polycrystalline ingot casting and quartz crucible, which is applied in the direction of polycrystalline material growth, chemical instruments and methods, crystal growth, etc., can solve the problems of high manufacturing cost, high difficulty in controlling single-crystal or high-efficiency polycrystalline processes, and ingot cost Advanced problems, to achieve the effect of reducing the difficulty of process control, improving primary utilization, and reducing processing costs

Inactive Publication Date: 2015-05-27
JIANGSU MEIKE SILICON ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that ordinary ingot nucleation control is difficult, the black edge width is wide, the efficiency is low, the single crystal or high-efficiency polycrystalline process is di...

Method used

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Examples

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Effect test

Embodiment 1

[0028] A quartz crucible for polycrystalline ingots capable of controlling nucleation and impurity diffusion, the preparation method of which comprises the following steps:

[0029] (1) prepare high-purity quartz sand slurry, be that 150 orders, purity be 99.995% single crystal crucible with grain size with high-purity quartz sand and grain size be 250 orders, the polycrystalline crucible with purity 99.99% use high-purity quartz sand with 1 : The weight ratio of 1 is mixed evenly to obtain quartz sand, the total content of metal ions in the high-purity sand for single crystal crucible and the high-purity sand for polycrystalline crucible is 18ppm; then the content of Fe element is 4ppm ionized water as binder; finally Mix the quartz sand and the binder at a weight ratio of 1:2, and stir evenly to obtain a high-purity quartz sand slurry;

[0030] (2) prepare high-purity fine sand slurry, first with the content of Fe element be 4ppm ionized water as binding agent, be that parti...

Embodiment 2

[0037] A quartz crucible for polycrystalline ingots capable of controlling nucleation and impurity diffusion, the preparation method of which comprises the following steps:

[0038] (1) prepare high-purity quartz sand slurry, be that 200 orders, purity are 99.998% single-crystal crucible high-purity quartz sand and particle size be 320 orders, purity be 99.999% polycrystalline crucible use high-purity quartz sand with 1 : The weight ratio of 3 is uniformly mixed to obtain quartz sand, the total content of metal ions in the high-purity sand for single crystal crucible and the high-purity sand for polycrystalline crucible is 15ppm; then the content of Fe element is 4.5ppm ionized water as binder; Finally, mix the quartz sand and the binder at a weight ratio of 1:4, and stir evenly to obtain a high-purity quartz sand slurry;

[0039] (2) prepare high-purity fine sand slurry, first the content of Fe element is 3ppm ionized water as binding agent, with particle size be 550 order, p...

Embodiment 3

[0046] A quartz crucible for polycrystalline ingots capable of controlling nucleation and impurity diffusion, the preparation method of which comprises the following steps:

[0047] (1) prepare high-purity quartz sand slurry, be that 180 orders, purity are 99.999% single-crystal crucible high-purity quartz sand and particle size be 380 orders, purity be 99.999% polycrystalline crucible use high-purity quartz sand with 1 : The weight ratio of 5 is mixed evenly to obtain quartz sand, the total metal ion content of high-purity sand for single crystal crucible and high-purity sand for polycrystalline crucible is 17ppm; then the content of Fe element is 3.5ppm ion water as binder; Finally, mix the quartz sand and the binder at a weight ratio of 1:3, and stir evenly to obtain a high-purity quartz sand slurry;

[0048] (2) prepare high-purity fine sand slurry, first the content of Fe element is 4.5ppm ionized water as binding agent, with particle size being 450 orders, purity is 99.9...

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Abstract

The invention discloses a quartz crucible capable of controlling a nucleation and impurity diffusion and used for a polycrystal cast ingot. A preparation method of the quartz crucible comprises the following steps: firstly, painting a high-purity coating on the inner surface of a common quartz crucible for the polycrystal cast ingot; painting a fine sand coating on the surface of the painted high-purity coating to reduce the roughness of the high-purity coating, sintering under a high temperature; painting a uniform compact nucleation source at the bottom of the crucible with the high-purity coating on the side. Based on a theory of controlling the nucleation long crystal, a layer of quartz sands with a certain granularity is creatively paved at the bottom of the crucible as the nucleation source to control the nucleation of the long crystal initial period, and an effective polycrystal silicon pellet the bottom of which has thin uniform crystal granules is formed. In the melting process, the silicon solution is fully melted, so that the rod-insertion melting test can be omitted and the process control difficulty is greatly reduced.

Description

technical field [0001] The invention relates to a processing method for a functional quartz crucible for polycrystalline ingots, belonging to the field of polycrystalline silicon ingots. Background technique [0002] At present, the preparation method of polycrystalline silicon ingots is mainly carried out by using the directional solidification system provided by GT Solar, which usually includes steps such as heating, melting, crystal growth, annealing and cooling. During the solidification and crystal growth process, the temperature of the top and the opening of the side insulation cover are controlled so that the molten silicon liquid can obtain sufficient supercooling at the bottom of the crucible to solidify and crystallize. An important auxiliary material used in the process of polycrystalline ingot casting, the quartz crucible for polycrystalline ingot casting, due to the isotropic characteristics of the bottom of the ordinary crucible, the nucleation of silicon liqui...

Claims

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Application Information

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IPC IPC(8): C30B28/06C30B29/06
Inventor 刘明权王禄宝
Owner JIANGSU MEIKE SILICON ENERGY
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