Silicon wafer is the basic material for making semiconductor chips. Silicon is the second most common element in the earth's crust, accounting for about 26%, second only to oxygen (49%). Silicon is widely present in high-concentration sand, gravel and rocks in the form of quartz (silica) in nature. Then through a series of complex processes such as purification and processing, it becomes the basic raw material-silicon wafer that meets the requirements of producing integrated circuits.