How To Melt Polysilicon?
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99.9999% Pure Si Silicon Granules Polysilicon Top and Tail to Melt Again Usage
Polysilicon is a very important material, which has a wide range of applications in optoelectronics, semiconductors, solar energy and other fields. The melting process of polysilicon plays a crucial role in its quality and performance. The melting process of polysilicon is described below.
The main raw material of polysilicon is silicon dioxide (SiO2). Silicon dioxide is first converted to crude silicon through a reduction reaction. Generally, silicon dioxide and carbon powder are reduced in a high-temperature furnace to remove the oxides in the silicon dioxide and obtain crude silicon. The polysilicon is then further refined to obtain high purity polysilicon.
Polysilicon smelting is generally carried out by electric arc melting or vapor phase method. In electric arc melting, crude silicon is melted in an electric arc furnace. An electric arc furnace is a device that uses electrical energy to heat a material with good electrical conductivity to a high temperature, causing it to melt. In the process of electric arc melting, the crude silicon is melted by heating, and then gradually cooled and solidified into polysilicon crystals. In the process of crystal, the impurities in the crystals can be minimized by stirring, pulling the crystal and other processes, so as to obtain high-purity polysilicon.
The gas phase method of melting polycrystalline silicon is by reacting silicon containing gas (usually silicon chloride SiCl4) with hydrogen at high temperature to form silicon, and by controlling the temperature and gas flow, the silicon block is gradually deposited on the substrate, and ultimately polycrystalline silicon single crystals are formed.
In addition, there is another method of melting polysilicon through the solution method, i.e., crude silicon is put in sodium hydroxide solution, so that the chemical reaction occurs at high temperature, and ultimately obtain polysilicon.
In the melting process of polysilicon, attention needs to be paid to controlling the reaction temperature, atmosphere, reaction time and speed, as well as the corresponding process parameters, so that the resulting polysilicon meets the requirements of all aspects and meets the technical requirements. At the same time, it is also necessary to maintain and repair the production equipment to ensure the stability of the production process and the consistency of the process parameters.
Overall, the melting process of polysilicon is a complex systematic engineering of integrated energy, materials, and process control, which requires comprehensive optimization of equipment and technology to produce high-quality, high-purity polysilicon products.
What is the price of polysilicon today?
| Overseas component prices on August 1 | ||||||
| name | Lowest Price | Highest Price | Average price | Rise and fall | unit | Remark |
| Monocrystalline PERC Bifacial Module - 182/210mm - USA | 0.22 | 0.26 | 0.24 | -- | US$/Watt | -- |
| Topcon Module-182/210mm-USA | 0.2 | 0.3 | 0.25 | -- | US$/Watt | -- |
| Monocrystalline PERC Bifacial Module - 182/210mm - Europe | 0.07 | 0.16 | 0.08 | -- | US$/Watt | -- |
| Topcon Module-182/210mm-Europe | 0.09 | 0.1 | 0.09 | -- | US$/Watt | -- |
How much does polysilicon cost?
| Overseas polysilicon prices on August 1 | ||||||
| name | Lowest Price | Highest Price | Average price | Rise and fall | unit | Remark |
| Overseas photovoltaic polysilicon | 16 | 20 | 18 | -- | US dollars/kg | |
What is the price of polysilicon per kg?
| August 1st China's guiding price for solar-grade polysilicon | |||||
| name | Lowest Price | Highest Price | Average price | Rise and fall | unit |
| N type dense material | 45 | 50 | 47.5 | -- | Yuan/kg |
| N type mixed bag material | 43 | 48 | 45.5 | -- | Yuan/kg |
| N-type granular silicon | 44 | 45 | 44.5 | -- | Yuan/kg |
| P-type re-feeding | 33 | 34 | 33.5 | -- | Yuan/kg |
| P type dense material | 31 | 32 | 31.5 | -- | Yuan/kg |
| P-type cauliflower material | 29 | 30 | 29.5 | -- | Yuan/kg |
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