What is polysilicon？

Polycrystalline silicon can be used as a raw material for pulling monocrystalline silicon. The difference between polycrystalline silicon and monocrystalline silicon is mainly manifested in physical properties. For example, in terms of mechanical properties, optical properties, and thermal properties, the anisotropy is far less obvious than that of single crystal silicon; in terms of electrical properties, the conductivity of polycrystalline silicon crystals is far less significant than that of single crystal silicon, or even almost no conductivity. In terms of chemical activity, the difference between the two is extremely small. Polycrystalline silicon and monocrystalline silicon can be distinguished from the appearance, but the real identification must be determined by analyzing the crystal plane direction, conductivity type and resistivity of the crystal. Polycrystalline silicon is the direct raw material for the production of monocrystalline silicon, and is the basic material of electronic information for contemporary semiconductor devices such as artificial intelligence, automatic control, information processing, and photoelectric conversion.