Patent ID: 7750365

Claim:
An insulated gate bipolar transistor comprising: a semiconductor substrate of a first conductivity type including a first main surface and a second main surface; an insulated gate transistor formed in a region of said semiconductor substrate on a side of said semiconductor substrate where said first main surface is included, said insulated gate transistor including a channel of said first conductivity type which is formed within a base region of a second conductivity type during an on state of said insulated gate transistor, said base region extending from said first main surface toward an interior of said semiconductor substrate; a first main electrode formed on said first main surface and being in contact with said base region of said insulated gate transistor at said first main surface; a first semiconductor layer of said first conductivity type formed on said second main surface of said semiconductor substrate, facing said insulated gate transistor; a second semiconductor layer of said second conductivity type formed on said second main surface of said semiconductor substrate, facing said insulated gate transistor, and vertically aligned with a region of the first main electrode in contact with said base region such that a center of the region of the first main electrode in contact with said base region is vertically aligned with a center of the second semiconductor layer; and a second main electrode formed on said first semiconductor layer and said second semiconductor layer, wherein an interface between said second main electrode and each of said first semiconductor layer and said second semiconductor layer is parallel to said first main surface, a distance between said first main surface and said interface is equal to 200 μm or smaller, and a thickness of each of said first semiconductor layer and said second semiconductor layer is equal to 2 μm or smaller.