Patent ID: 6331467
Filing Date: 2001-12-18
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device comprising a trench gate field effect device, which method comprises: providing a semiconductor body having first and second major surfaces with a first semiconductor region of one conductivity type separated from the first major surface by a second semiconductor region of the opposite conductivity type; etching a trench through the second semiconductor region; providing a gate within the trench; forming adjacent the trench a source region separated from the first region by the second region with a conduction channel area of the second region adjacent the trench providing a conduction path between the source and first regions which is controllable by the gate, characterised by providing an etch stop layer in the region of the pn junction between the first and second regions; and etching said trench using an etching process which enables the etching process to be stopped at the etch stop layer.