Polycrystalline silicon is a form of elemental silicon used in the electronics industry to make basic materials for semiconductor radios, tape recorders, color TVs, video recorders, and electronic computers. In the new energy industry, polysilicon is an important raw material for the production of solar cells, and the general purity is 6-9N. China is the world's largest producer of polysilicon. The main companies are Jiangsu Zhongneng Silicon Development Co., Ltd., Jiangxi LDK, TBEA Xinjiang New Energy Co., Ltd., Luoyang Zhongsi High-Tech Co., Ltd., etc.
Monocrystalline silicon refers to a single crystal of silicon, which is made of high-purity polycrystalline silicon in a single crystal furnace. A crystal with a substantially complete lattice structure. Different directions have different properties and are a good semiconducting material. Typical purity requirements are 9-12N. Used in the manufacture of semiconductor devices, solar cells, and the like.