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[Chemical Knowledge]：Properties and Uses of Polycrystalline Silicon

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The properties and uses of polysilicon play an important role in the field of raw materials for chemical production. In this paper, the properties, production methods, uses and future development prospects of polysilicon will be discussed in detail.

1. the nature of polycrystalline silicon

polycrystalline silicon is composed of countless small single crystal silicon, its crystal structure is mainly composed of silicon atoms connected by covalent bonds. Polycrystalline silicon has many unique properties, such as good electrical properties, high thermal conductivity, high hardness, good corrosion resistance, oxidation resistance, etc. In addition, polycrystalline silicon also has good optical properties and high absorption rate of sunlight, so it is widely used in the field of solar cells.

2. polysilicon production method

polysilicon production method mainly has two kinds: physical method and chemical method. Physical methods include zone melting method and vacuum melting method, mainly through the physical process of silicon purification. Chemical laws include Siemens and fluidized bed methods, which mainly reduce silicon compounds to pure silicon through chemical reactions. Among them, the Siemens method is the mainstream method of producing polysilicon, which has the advantages of large yield, high purity and low cost.

3. the use of polycrystalline silicon

polycrystalline silicon in the field of chemical production raw materials have a wide range of uses, mainly for the manufacture of semiconductor devices, integrated circuits, solar cells and so on. The following are the specific applications of polysilicon in various fields:

1. Semiconductor industry: Polysilicon is an important raw material for manufacturing semiconductor devices and integrated circuits, and its purity requirements are very high, usually above 9N(99.9999999%).
2. Solar cells: Polycrystalline silicon is the main material of solar cells. Due to its high absorption rate of sunlight, solar cells have high conversion efficiency.
3. Other fields: In addition to semiconductors and solar cells, polysilicon can also be used to manufacture optical fibers, infrared detectors, piezoelectric crystals, etc.

4. the development prospects of polysilicon

With the continuous development of science and technology, the application of polysilicon in the field of chemical production raw materials will be more extensive. In the future, the production technology of polysilicon will continue to improve, and the production cost will be further reduced, thereby improving its application competitiveness in various fields. At the same time, as the global demand for renewable energy continues to increase, the solar cell market will continue to expand, which will further promote the development of polysilicon. In addition, the application of polysilicon in other fields will continue to expand, bringing more possibilities for the field of chemical production raw materials.

In short, as an important raw material for the production of chemical products, polysilicon has broad application prospects in the future development. With the continuous advancement of technology and the increase of market demand, polysilicon will play a more important role in the field of chemical production raw materials and make greater contributions to the development of the chemical industry.

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