Refers to the raw material used for growing monocrystalline silicon, which is in a polycrystalline structure with impurities ranging from a few parts per billion (ppb). According to the shape, it can be divided into rod, block and granular polycrystalline silicon; According to the use and purity, it can be divided into electronic grade Czochralski siliconcrystalline, zone melting siliconcrystalline, detector grade and solar cell grade polycrystalline silicon. Usually, high-purity gas containing silicon is used as the source to form polycrystalline silicon through high-temperature chemical reaction or thermal decomposition deposition. The mainstream preparation processes are: trichlorosilane hydrogen reduction method (Siemens method) and silane method.
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