Patent ID: 6547875
Filing Date: 2003-04-15
Classification: C30B,H01L

Abstract:
An epitaxial wafer manufacturing method comprising the steps of:pulling a single silicon ingot, making a silicon wafer by slicing said silicon ingot, and forming a single silicon crystal epitaxial layer on said silicon wafer by means of a chemical vapor deposition method, wherein on the assumption that a pulling speed is V (mm/minute) and a temperature gradient in an axial direction in the center of said ingot is Ga (Â° C./mm) and a temperature gradient in the axial direction in the periphery of said ingot is Gb (Â° C./mm) in a temperature range from the melting point of silicon to 1300Â° C., said ingot is pulled so that V/Ga and V/Gb are respectively 0.23 to 0.50 mm2/minuteÂ° C., and the epitaxial layer is formed with 0.2 to 5 &mgr;m in thickness on the surface of the silicon wafer.