Polysilicon is a form of elemental silicon. When the molten elemental silicon is solidified under supercooling conditions, the silicon atoms are arranged in a diamond lattice form into a plurality of crystal nuclei. When the crystal nuclei grow into crystal grains with different crystal orientations, the crystal grains are combined and crystallized into polycrystalline silicon. .

 Commercial value: From the development of solar cells, it can be seen that the development trend is from monocrystalline silicon to polycrystalline silicon, ribbon silicon, and then thin film materials (including microcrystalline silicon-based films, compound-based films and dye films).