Patent ID: 6660591
Filing Date: 2003-12-09
Classification: H01L

Abstract:
A method of manufacturing a trench-gate semiconductor device having a trench-gate in a trench that extends from a source region of a first conductivity type through a channel-accommodating region of a second conductivity type to a drain region of the first conductivity type, wherein:(a) a narrow window is defined by providing sidewall extensions at the sidewalls of a wider window in a first mask at a surface of a semiconductor body, (b) a trench is etched into the body at the narrow window, and the gate is provided in the trench, (c) the source region is provided so as to adjoin a sidewall of the trench, and (d) the channel-accommodating region is provided using the following sequence of steps: removing the sidewall extensions to leave at least a part of the first mask at the surface of the body and to form a doping window between the first mask part and the trench-gate, and introducing dopant of the second conductivity type into the body at least via the doping window so as to form the channel-accommodating region adjacent to the sidewall of the trench and extending laterally below the first mask part.