Industrial silicon is an important part of my country's non-ferrous metal industry, and has received extensive attention at home and abroad in recent years. The subdivision products of industrial silicon are mainly divided into single polysilicon, organic silicon and alloy silicon. Its downstream applications have penetrated into related industries such as defense and military industry, information industry, and new energy. It has a special position in global economic development. It is a new energy, It is an indispensable and important material for the development of the new material industry, showing a broad application prospect.
Industrial silicon is purified by a series of processes to generate polysilicon and monocrystalline silicon, which are used in the photovoltaic industry and the electronics industry. Polycrystalline silicon cells are mainly used in solar rooftop power stations, commercial power stations and urban power stations with high land costs. They are currently mature and widely used solar photovoltaic products, and their demand for metal silicon has grown significantly. Modern large-scale integrated circuits are almost made of high-purity metal silicon, and high-purity metal silicon is also the main raw material for the production of optical fibers. It can be said that metal silicon has become an industry in the information age.
As the most upstream part of the photovoltaic industry, silicon material is the core material of the solar cell production process. The principle of the effect of silicon material is that silicon is a semiconductor material. When it is irradiated by sunlight, the photoelectric effect will occur to generate electricity. At present, the silicon material produced by the vast majority of existing photovoltaic manufacturers mostly uses the modified Siemens method.
As an important basic raw material for the photovoltaic industry, the demand for polysilicon has maintained steady growth in recent years. From 2015 to 2020, China's polysilicon production increased from 165,000 tons to 392,000 tons, with a CAGR of 18.9%. Entering 2021, the production capacity of downstream silicon wafers, cells, and modules in the photovoltaic industry has been put into production one after another, and the increase in production capacity has greatly exceeded that of polysilicon, driving the price of polysilicon all the way up. %.