High temperature diffusion furnace
A diffusion furnace is one of the most important pieces of equipment in the semiconductor manufacturing process. Its main purpose is to dope the silicon wafer under high temperature conditions so that the dopant atoms can diffuse in the silicon wafer to achieve the purpose of doping.
Through process control, substances with different characteristics are diffused from the surface of the silicon wafer to a specified depth and concentration by means of heat treatment, thereby changing and controlling the type, concentration, and distribution of impurities in the semiconductor so as to establish regions with different electrical characteristics. The machine used for high-temperature diffusion doping is called a "high temperature diffusion furnace".