Patent ID: 6368925
Filing Date: 2002-04-09
Classification: H01L

Abstract:
A method of forming an epi-channel in a semiconductor device, comprising:sequentially forming a pad oxide film and a nitride film on a surface of a semiconductor substrate and then patterning the pad oxide film and the nitride film to leave an exposed portion of the semiconductor substrate; etching the exposed portion of the semiconductor substrate to form a trench structure and then covering said trench structure with an insulating material; removing said nitride film and then implementing an ion implantation process for forming a well; forming a screen oxide film in the well and then implementing an ion implantation process for adjusting a threshold voltage; removing crystal defects and the screen oxide film on the surface of said semiconductor substrate by a H2 bake process; and growing the exposed semiconductor substrate by a SEG process to form an epi-channel.