Patent ID: 8319314

Claim:
A semiconductor device, comprising: a first base layer of a first conductivity type; a plurality of second base layers of a second conductivity type provided on a part of a first surface of the first base layer; a plurality of trenches formed entirely between the second base layers adjacent to each other, widths of the trenches being wider than those of the second base layers, and depths of the trenches being deeper than those of the second base layers; an emitter layer formed along one of the trenches on a surface of one of the second base layers; a collector layer of the second conductivity type, provided below a second surface of the first base layer opposite to the first surface; a plurality of insulating films formed on inside surfaces of the trenches; and a space section including at least a gate electrode formed within each trench, and isolated from the second base layers and the emitter layer by one of the insulating films, wherein a plurality of gate electrodes are provided in each trench, respectively; and the device further comprises an intervention insulating film filled between the gate electrodes in each trench.