Polysilicon is a form of elemental silicon. When the melted elemental silicon solidifies under supercooling conditions, the silicon atoms are arranged in a diamond lattice shape into a plurality of crystal nuclei. If these crystal nuclei grow into crystal grains with different crystal orientations, these crystal grains combine to crystallize into polysilicon. . The use of polysilicon value From the current point of view, the development of international solar cells can be seen in its development trend of single crystal silicon, polysilicon, ribbon silicon, thin film materials.
Polycrystalline silicon has a large chemical reactivity in the molten state at high temperatures and can work with almost any material. Polysilicon has semiconducting properties and is an extremely important and excellent semiconductor material, but trace impurities can greatly affect its conductivity. Polysilicon is widely used in the electronics industry for manufacturing basic materials such as semiconductor radios.
Polysilicon can be used as a raw material for drawing monocrystalline silicon. The difference between polycrystalline silicon and monocrystalline silicon is mainly manifested in the physical properties. For example, the anisotropy of mechanical properties, optical properties, and thermal properties is far less pronounced than monocrystalline silicon; in terms of electrical properties, the polysilicon crystals are far less conductive than single crystal silicon, and even have almost no conductivity. In terms of chemical activity, the difference between the two is minimal. Polysilicon and monocrystalline silicon can be distinguished from each other in appearance, but the actual identification must be determined by analysis of crystal orientation, conductivity type, and resistivity.
Polysilicon is a direct raw material for the production of monocrystalline silicon, and it is the basic electronic information material for contemporary semiconductor devices such as artificial intelligence, automatic control, information processing, and photoelectric conversion. It is called "the cornerstone of the microelectronics building."
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