Patent ID: 6429078
Filing Date: 2002-08-06
Classification: H01L

Abstract:
A method of manufacturing an insulating-gate semiconductor device, comprising:forming a channel layer of a conduction type in a surface region of a semiconductor substrate so that the channel layer is disposed in the surface region and above a remainder of the surface region in which is formed a drain region, said surface region having an opposite conduction type to the channel layer; forming a first insulating film on the surface region; forming an opening for forming a trench in the first insulating film; forming a second insulating film over the opening; forming a side-wall film around a side wall of the opening by anisotropic etching of the second insulating film; forming a trench piercing through the channel layer by etching, said first insulating film and said side-wall film being used as a mask; forming a gate insulating film on an inside wall of the trench; forming a gate electrode by filling the trench with a semiconductor material; and forming a source region adjacent to the filled trench in a surface region of the channel layer, the conduction type of said source region being the same as the conduction type of the drain region.