Controversies surrounding the production of polysilicon using the modified Siemens method
Thread Content
The demand for polysilicon in the market mainly comes from integrated circuits and solar cells. Depending on the purity requirements, polysilicon is further divided into electronic-grade and solar-grade. The modified Siemens method is the current mainstream production process for polysilicon; polysilicon produced using this method has a high purity, which can reach between 9 and 11 nines. However, research has shown that the polysilicon used in solar photovoltaic cells only needs to have a purity of 6–7 nines, and it is not necessary to reach the high-purity electronic-grade standard. With the rapid development of the photovoltaic industry, the demand for solar polysilicon far exceeds that for electronic-grade polysilicon. Undoubtedly, if there were a process dedicated to producing solar polysilicon, the costs across the entire photovoltaic industry chain would be significantly reduced. Despite its widespread adoption, the improved Siemens process still remains plagued by issues such as high investment costs, high energy consumption, and the fact that its core technologies are no longer available domestically. In China, solar cells produced using the metallurgical method for polycrystalline silicon have already been put into use. In December 2009, a 10MW photovoltaic power plant made from metallurgical polysilicon materials produced by Ningxia Yinxing began generating electricity on the Sun Mountain in Ningxia ； In May 2010, the full-polycrystalline silicon solar power plant using Shanghai Pro Metalurgical method for polycrystalline silicon production was connected to the grid, with a capacity of 1 MW ； In 2010, Ningxia Power Generation Group will also build another 100MW of photovoltaic power plants in areas such as Hongsibao and Gaosawo, all of which will use the metallurgical method for producing polysilicon.
Hehe, whose polysilicon has a purity of 9-11N? On the other hand, the claim that \"although the improved Siemens process is widely used, it still cannot escape the problems of high investment, high costs, high energy consumption, and the fact that the core technologies are no longer available domestically\" does not correspond to reality; one should not always accept things at face value.
I have heard of the metallurgical method; those who are familiar with it could please provide a detailed explanation so we can learn together.
The metallurgical method can achieve 5N, right? Does that meet the requirements for solar energy?
The production capacity of the fluidized bed method is also high; currently, researchers in China are studying it, and there is no problem using the products produced to manufacture solar cells. The key technologies are in the hands of the Japanese, and it was because of one ** incident that they also stopped. However, low investment costs and high production capacity are also the greatest advantages of this method.
The production capacity of the fluidized bed method is also high; currently, some people in China are researching it as well, though it’s not clear who exactly
The China Silicon Industry Online Forum welcomes you to join us at www.sizxbbs.com – a collaboration platform for key silicon materials laboratories, serving the entire silicon materials industry! Experts, scholars, and friends in related research fields and the silicon materials industry are welcome to join! Website: http://www.sizxbbs.com/index.php Welcome to bookmark it