Patent ID: 7910962

Claim:
A SOI trench lateral IGBT comprising: a support substrate; a semiconductor layer of a first conductivity type on the support substrate via an insulating layer; a first semiconductor region of the first conductivity type having a higher resistivity than the semiconductor layer on the semiconductor layer; a second semiconductor region of the first conductivity type having a lower resistivity than the first semiconductor region on the first semiconductor region; a third semiconductor region of a second conductivity type on the first semiconductor region in contact with the first semiconductor region and the second semiconductor region; a gate electrode on the third semiconductor region via a gate insulating film; an emitter region of the first conductivity type in the third semiconductor region; a low resistance region of the second conductivity type in the third semiconductor region below the emitter region; a high conductivity region of the second conductivity type in the third semiconductor region adjacent to the emitter region; a fourth semiconductor region of the first conductivity type having a lower resistivity than the first semiconductor region on the first semiconductor region and spaced from the second semiconductor region and the third semiconductor region; a collector region of the second conductivity type in the fourth semiconductor region; a trench between the third semiconductor region and the fourth semiconductor region; a trench-filling insulating film filling the trench; an emitter electrode contacting the emitter region and the high conductivity region; a collector electrode contacting the collector region; an emitter-side conductive region having a floating potential buried in an upper half portion of the trench-filling insulating film in the vicinity of the third semiconductor region; and a collector-side conductive region buried in the upper half portion of the trench-filling insulating film in the vicinity of the fourth semiconductor region, wherein the collector electrode is electrically connected to the collector-side conductive region.