Patent ID: 6498071
Filing Date: 2002-12-24
Classification: H01L

Abstract:
A method of manufacturing a trench-gate semiconductor device having source and drain regions which are separated channel-accommodating body region adjacent to the trench-gate, including the steps of:(a) forming at a surface of a semiconductor body a mask having a window at an area of the body, (b) etching a trench into the semiconductor body at the window to extend through the body region and into an underlying portion of the drain region, (c) providing gate material in the trench and in the window such that the gate material forms a protruding step from the adjacent surface of the semiconductor body with the mask still present, (d) removing the mask from the protruding step and thereafter forming a side wall spacer in the step to replace the mask, (e) forming the source region with a lateral extent from the trench being determined by the spacer, (f) providing an insulating overlayer over the gate after using the sidewall spacer for the source region formation, and (g) providing a source electrode to contact exposed surfaces of the source region and body region and also to extend on the gate insulating overlayer.