(1) A variety of production processes and routes coexist, industrialization technology blockade, monopoly situation will not change. Since the main and auxiliary raw materials used in each polysilicon production plant are different, the production process technology is different; and the corresponding polysilicon product technical and economic indicators, product quality indicators, uses, product testing methods, process safety, etc. also have differences, each with technical characteristics. And technical secrets, in general, the main traditional processes of polysilicon production in the world are: modified Siemens method, silane method and fluidized bed method. Among them, the production capacity of polysilicon produced by the modified Siemens process accounts for about 80% of the world's total production capacity, and the monopoly blockade of industrialization technology will not change in the short term.
(2) Research on a new generation of low-cost polysilicon process technology is unprecedentedly active. In addition to the traditional process (electronic and solar grade compatible) and technology upgrades, several new process technologies specializing in the production of solar grade polysilicon have emerged, mainly including: low-cost process of modified Siemens method; metallurgy extraction from metal silicon High-purity silicon; high-purity SiO2 directly prepared; VLD: Vaper to liquid deposition; reduction or thermal decomposition process; chlorine-free process technology, Al-Si solution low-temperature preparation of solar grade silicon; molten salt electrolysis.
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