In the complete chain of the semiconductor industry, semiconductors are the core materials throughout. High-purity silicon is the mainstream, and its conductivity is between conductors and insulators. Electrical characteristics can be precisely adjusted through doping processes, laying the foundation for subsequent device manufacturing. The silicon wafer (referred to as Wafer, that is, wafer) processed from this semiconductor material is the core carrier of circuit fabrication - after being treated by crystal pulling, slicing, polishing and other processes, a flat surface and a very low impurity content are formed. Circular thin sheets (common sizes are 6 inches, 8 inches, 12 inches) become the "base platform" for carrying circuit patterns.