Purifying system of high purity polysilicon and purifying method

A purification method and polysilicon technology, applied in the field of purification system, can solve the problems of inability to realize industrialized production, low production efficiency, complicated operation, etc., and achieve the effect of high degree of automation, high production efficiency and simple equipment

Active Publication Date: 2010-09-08
上海太阳能电池研究与发展中心
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although this method can achieve the purpose of purification to a certain extent, it is complicated to operate under high temperature conditions and can only be carrie

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  • Purifying system of high purity polysilicon and purifying method
  • Purifying system of high purity polysilicon and purifying method
  • Purifying system of high purity polysilicon and purifying method

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Example Embodiment

[0024] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0025] see figure 1 , The purification system of high-purity polysilicon of the present invention includes: a silicon melting device 2, an electromigration device 3, and a directional solidification device 4 placed in a closed cavity 1. The silicon material melting device and the electromigration device are connected through the first overflow pipe 21, and the electromigration device and the directional solidification device are connected through the second overflow pipe 31.

[0026] The silicon material melting device is composed of a melting crucible 23 placed in an intermediate frequency induction coil 22. Above the melting crucible, a vacuum feeding device 5 is arranged on the top surface of the closed cavity 1. The first overflow pipe 21 extends from the middle of the bottom of the melting crucible into the melting crucible, and ex...

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Abstract

The invention discloses a purifying system of high purity polysilicon and a method for preparing the high purity polysilicon by using the system. The system comprises a silicon material melting device arranged in a closed cavity, an electromigration device and an orientation solidification device, wherein the silicon material melting device and the electromigration device are connected through a first overflow pipe, and the electromigration device and the orientation solidification device are connected through a second overflow pipe. The method is characterized in that a horizontal direct current electric field which is vertical to the flowing direction of silicon liquid is forced on melted silicon liquid, cation impurities and anion impurities in the silicon liquid respectively migrate towards the direction of a cathode and the direction of an anode under the function of an electric field and gather in electrode regions at both sides, high impurity concentration silicon liquid and high purity silicon liquid are separated by a division baffle, the high purity silicon liquid is treated by orientation solidification ingot casting, and finally, a high purity polysilicon ingot is obtained. The invention can realize large scale continuous purifying production of high purity silicon and has the advantages of favorable purifying effect, simple equipment, little investment and low production cost.

Description

technical field [0001] The invention relates to a purification system for preparing high-purity polysilicon and a method for preparing high-purity polysilicon by using the system. Background technique [0002] With the rapid development of the photovoltaic industry, the demand for polysilicon raw materials for the production of crystalline silicon solar cells is increasing. At present, high-purity polysilicon is mainly produced by the improved Siemens method. Although the polysilicon obtained by this method has high purity, the energy consumption in the production process is too large, making the price high, which cannot meet the low-cost development requirements of solar cells, and hinders photovoltaic power generation. popularity. In recent years, some new technologies and methods for preparing solar-grade polysilicon have been developed rapidly, including not only traditional purification processes such as out-of-furnace refining, vacuum refining, hydrometallurgy, and di...

Claims

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Application Information

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IPC IPC(8): C30B29/06C30B28/02
Inventor 胡建锋熊斌徐璟玉蒋君祥戴宁褚君浩
Owner 上海太阳能电池研究与发展中心
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