The development trend of polysilicon, the difference between industrial silicon and polysilicon

1. When the molten elemental silicon solidifies, the silicon atoms are arranged into many crystal nuclei in a diamond lattice, and if these crystal nuclei grow into grains with the same crystal plane orientation, a single crystal silicon is formed.

If these nuclei grow into grains with different plane orientations, polysilicon is formed.

2. The difference between polycrystalline silicon and monocrystalline silicon is mainly manifested in physical properties.

For example, in terms of mechanical and electrical properties, polysilicon is inferior to monocrystalline silicon.

3. Polysilicon can be used as a raw material for drawing monocrystalline silicon. Monocrystalline silicon can be regarded as the purest substance in the world, and general semiconductor devices require silicon with a purity of more than six 9s.

4. The requirements for large-scale integrated circuits are higher, and the purity of silicon must reach nine 9s.

Production of industrial silicon.

Industrial silicon is obtained by smelting silica (quartz sand) as raw material and carbonaceous material as reducing agent.

The commonly used reducing agents mainly include charcoal, petroleum coke, coal, etc., which can reduce silicon metal from silica. The silica and the reducing agent undergo a reduction chemical reaction in the furnace at high temperature. <>

Polysilicon can be used in the semiconductor industry, electronic information industry, and solar photovoltaic cell industry, and polysilicon is the most important and basic functional material in these industries. Polysilicon, a form of elemental silicon, is soluble in the mixed acid of hydrofluoric acid and nitric acid, and insoluble in water, nitric acid and hydrochloric acid.

The hardness of polysilicon is between germanium and quartz, brittle at room temperature, easy to break when cut, ductile when heated to more than 800, and obvious deformation at 1300.

Polysilicon is inactive at room temperature, reacts with oxygen, nitrogen, sulfur hail at high temperature, and has greater chemical activity in the high-temperature molten state, and can interact with almost any material.

Polysilicon is widely used in the electronics industry as a basic material for the manufacture of semiconductor radios, tape recorders, refrigerators, color televisions, video recorders, electronic computers, etc.

1.Solar cells: Polysilicon is one of the main raw materials for the manufacture of solar cells, which can be processed into photovoltaic cells.

2.Thin-film transistors (TFTs): In liquid crystal displays (LCDs), polysilicon is used to make thin-film transistors for screens.

3.Integrated circuits: In ULSI chip manufacturing, polysilicon can be used as a substrate material or layered with a non-rotating material.

4.MEMS: Used to manufacture a variety of mechanical microstructures and devices in microelectromechanical systems.

5.Silicon carbide ceramics: as a reinforcing phase, it is added to the silicon carbide matrix in the shooting section to improve the mechanical properties of the ceramic.

6.Solar thermal utilization: Polysilicon can convert sunlight to produce high temperatures for the conversion of solar thermal energy.

7.Optoelectronics: Polycrystalline silicon substrates can be used to make devices such as solar cells and photodiodes.

8.Thermistor: Used to measure temperature changes and convert them into a resistance signal.

9.Piezoelectric vibrating sheet: Combined with quartz glass, it is made into a piezoelectric vibrating plate.

1. Polycrystalline silicon is a direct raw material for the production of monocrystalline silicon, and its use is mainly for the production of monocrystalline silicon and solar photovoltaic cells. At present, there are two main production methods for monocrystalline silicon: one is the straight-pull method; The other is zone melting.

In both the Zhizo-pull and zone melting methods, the raw material used is polysilicon. Solar PV cells can also be made directly from polysilicon.

Polysilicon is a form of elemental silicon. When the molten elemental silicon solidifies under the supercooled strip cherry nut, the silicon atoms are arranged into many crystal nuclei in the form of a diamond lattice, and if these crystal nuclei grow into crystals with different crystal plane orientations, these grains are combined to crystallize into polysilicon.

3. Polycrystalline silicon has gray metallic luster and density. Melting point 1410. Boiling point 2355.

Soluble in mixed acids of hydrofluoric acid and nitric acid, in water, nitric acid and hydrochloric acid. The hardness is between germanium and quartz, brittle at room temperature, and easy to crumble when cut. When heated to more than 800 meters, it has ductility, and at 1300 meters, it shows obvious deformation.

It is inactive at room temperature, and reacts with oxygen, nitrogen, sulfur, etc. at high temperature.

According to the analysis of QYResearch "2021-2027 China Polysilicon Market Status and Future Development Trend"; China has been the world's largest consumer of polysilicon for the past few years and will remain so in the years to come. In 2015, the Chinese market accounted for 56% of the global market, followed by the United States (18%), followed by Europe and South Korea with a market share of about 7%.

GCL, Wacker Chemie, Hemlock Semiconductor, OCI, REC Silicon, TBEA, Sunedision, GCL, KCC, and Tokuyama are the major players in the global polysilicon market. The top four companies account for about 60% of the global market. GCL Group is the world's largest businessmen, while GCL Group, TBEA, and GCL Group are China's leading local companies, with a local market share of about 44%.

Tokuyama is one of Japan's leading merchants.

This report examines the production, consumption, import and export of polysilicon in the Chinese market, focusing on global and local polysilicon producers that play an important role in the Chinese market, and presents key indicators such as polysilicon sales, revenue, **, gross margin, and market share of these manufacturers in the Chinese market. This paper also examines the polysilicon production capacity, sales, revenue, and market share of local Chinese manufacturers. In addition, this paper also makes an in-depth analysis of the segmentation growth of polysilicon products themselves, such as different polysilicon product types, sales volume, revenue, and market sales of polysilicon by different applications.

Historical data from 2016 to 2021 and ** data from 2021 to 2027.