Patent ID: 7695997
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method of manufacturing a semiconductor device having a semiconductor base, a hetero semiconductor region brought into contact with a first main surface of the semiconductor base and formed of a semiconductor material different in band gap from the semiconductor base, the hetero semiconductor region having an opening portion extending to a surface of the semiconductor base, a gate electrode formed with a gate insulating film provided in the opening portion, a source electrode connected to the hetero semiconductor region, and a drain electrode ohmically connected to the semiconductor base, the semiconductor device including an electrostatic protection passive element formed on the semiconductor base with a field insulating film interposed therebetween, the method comprising: a field insulating film forming step of forming the field insulating film interposed between the passive element and the semiconductor base so that a film thickness of the field insulating film can be thicker than a film thickness of the gate insulating film; a first-layer semiconductor film forming step of, in an event of forming a layer of the hetero semiconductor region, forming both semiconductor layers of the hetero semiconductor region and a first-layer semiconductor region of the passive element on the semiconductor base and the field insulating film, respectively, by using the same first-layer semiconductor film; and a first-layer semiconductor film dividing step of dividing the formed first-layer semiconductor film into a plurality of predetermined regions, which are the hetero semiconductor region and the one or more divided first-layer semiconductor regions of the passive element, wherein impurities of a predetermined conduction type are introduced into the one or more divided first-layer semiconductor regions formed by dividing the first-layer semiconductor film in the first-layer semiconductor film dividing step.