Epitaxy: growing a single crystal layer with certain requirements (thickness and doping concentration) on a single crystal substrate (substrate) is like the original crystal extending to the epitaxy, which is epitaxy. Silicon carbide epitaxial wafer is an epitaxial wafer grown with silicon carbide single crystal as the substrate. Application fields and industries: Epitaxial wafers are mainly used to make various discrete devices, such as SBD, MOSFET, JFET, BJT, SIT, MESFET, etc., which are widely used in white goods, hybrid and pure electric vehicles, solar and wind power generation, UPS, motor control, rail locomotives, ships, smart grid and other fields. By the way, silicon carbide epitaxial wafers belong to the semiconductor industry.