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Process for preparing polysilicon for P-type solar cell

A solar cell and polysilicon technology, applied in the field of smelting, can solve the problems of large hidden dangers in production safety, unstable product quality, and short service life of equipment, and achieve the effects of prolonging the service life of equipment, stable and reliable product quality, and safe production.

Inactive Publication Date: 2010-03-17
靳瑞敏
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Problems solved by technology

There are defects such as process discontinuity, high energy consumption, environmental pollution, short service life of equipment, large production safety hazards, and unstable product quality.

Method used

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  • Process for preparing polysilicon for P-type solar cell
  • Process for preparing polysilicon for P-type solar cell

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Embodiment Construction

[0023] In conjunction with the accompanying drawings and embodiments, the specific steps of the present invention "a process for producing polysilicon for P-type solar cells" and the specific structure of related equipment are further described.

[0024] A kind of embodiment of the technique of producing polysilicon for P-type solar cell of the present invention, see figure 1 , with the following process steps:

[0025] 1. Select silicon raw material. Using metallurgical grade industrial silicon as the raw material, select the metal impurities, phosphorus and boron impurities in the raw materials as the main impurity content limit indicators; metal impurities are limited to within 100PPm, phosphorus and other group V elements are limited to about 10PPm, boron and other group III elements are controlled at Below 1PPm;

[0026] 2. Silicon liquid slagging. The raw materials are fed into the intermediate frequency heating furnace to be melted into silicon liquid, and at least o...

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Abstract

The invention provides a process for preparing polysilicon for P-type solar cells. The process is mainly characterized in that the process comprises the following steps: selecting raw silicon, siliconsolution slagging, vacuum straight-pulling, silicon solution lighting and ingot casting. The process improves greatly the traditional method of extracting polysilicon, cancels the room temperature picking (alkali treating ) step and increases the silicon solution lighting and vacuum straight-pulling steps, automatic feeding can be realized from the silicon solution slagging step to the vacuum straight-pulling step; compared with the traditional method, the process of the invention has the advantage that the process is scientific, the flow is continuous, the energy is saved, the pollution is reduced, the service life of devices is prolonged, the production is safe, the product quality is stable and reliable, etc.

Description

technical field [0001] The invention belongs to the technical field of smelting and relates to a process for producing polysilicon for P-type solar cells. Background technique [0002] At present, the methods of producing polysilicon at home and abroad are mainly chemical and physical methods. The so-called chemical method is that the silicon element in metal silicon participates in a chemical reaction to become a silicon compound silicon tetrachloride or trichlorosilane, and then the silicon compound is separated from the impurities, and finally, the silicon element is reduced to form polysilicon . Other chemical methods include silane method and fluidized bed method. The main problem facing the domestic chemical law is chemical pollution. The hydrochlorination of metal silicon will bring harmful gas and liquid, and the reduction of trichlorosilane will also bring about the emission of harmful gas. These harmful substances not only pollute the environment, but also incre...

Claims

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Application Information

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IPC IPC(8): C01B33/037C30B28/10C30B29/06
CPCY02P20/10
Inventor 靳瑞敏李定珍王玉仓郭新峰
Owner 靳瑞敏
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