Patent ID: 9425271
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. An insulated-gate bipolar transistor (IGBT) comprising: a semiconductor substrate; an emitter electrode; a collector electrode; and a gate electrode, wherein: a trench that is formed in a first major surface of the semiconductor substrate, which is one major surface of the semiconductor substrate, the trench extending in a bent shape to have a corner in a plan view of the semiconductor substrate on a first major surface side, the trench defining a rectangular region in the plan view of the semiconductor substrate on the first major surface side; an inside surface of the trench is covered with an insulating film; the gate electrode is placed inside the trench; the emitter electrode is formed on the first major surface of the semiconductor substrate; the collector electrode is formed on a second major surface of the semiconductor substrate, which is another major surface of the semiconductor substrate; and the semiconductor substrate includes therein: a high concentration n-type region is formed between a portion of the body region and the drift region, wherein the high concentration n-type region is formed of an n-type semiconductor, and is separated from the emitter region by the body region, and the high concentration n-type region separates the portion of the body region from the drift region, and is higher in concentration of n-type impurity than the drift region, and the emitter region and the body region are formed in the rectangular region, in the rectangular region in the plan view of the semiconductor substrate, a total length of a boundary line where the emitter region is in contact with the insulating film is shorter than a total length of a boundary line where the body region is in contact with the insulating film, in the plan view of the semiconductor substrate, the body region includes a first body region portion and a second body region portion, the first body region portion extending along an entire length between a first corner and a second corner of the rectangular region, and the second body region portion extending along an entire length between a third corner and a fourth corner of the rectangular region, and the emitter region includes no more than a first emitter portion and a second emitter portion, the first emitter portion separating the first body region portion from the second body region portion between the first corner and the third corner of the rectangular region, and the second emitter portion separating the first body region portion from the second body region portion between the second corner and the fourth corner of the rectangular region, and wherein the high concentration n-type region is a barrier region that separates the body region into a first major surface-side body region and a second major surface-side body region; the first major surface-side body region is in contact with the emitter region; the barrier region is formed of an n-type semiconductor, and is formed on a side closer to the second major surface with respect to the first major surface-side body region; and the second major surface-side body region is formed on a side closer to the second major surface with respect to the barrier region.