Patent ID: 11876131
Assignee: FUJI ELECTRIC CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A semiconductor device, comprising:
a semiconductor substrate of a first conductivity type including a semiconductor material having a bandgap that is wider than that of silicon;
a second-conductivity-type region of a second conductivity type provided in a surface layer of a first main surface of the semiconductor substrate;
a barrier metal disposed on the second-conductivity-type region;
an insulated-gate field effect transistor with a trench gate structure having a gate electrode, including a base region, a source pad and a gate pad, the base region comprising the second-conductivity-type region, the source pad being electrically connected to the second-conductivity-type region via the barrier metal, the gate pad being electrically connected to the gate electrode;
an insulating layer disposed on the semiconductor substrate;
a second-conductivity-type poly-silicon layer of the second conductivity type provided on the first main surface of the semiconductor substrate, via the insulating layer;
a first-conductivity-type poly-silicon layer of the first conductivity type provided on the first main surface of the semiconductor substrate next to the second-conductivity-type poly-silicon layer, via the insulating layer, a side face of the first-conductivity-type poly-silicon layer being in contact with a side face of the second-conductivity-type poly-silicon layer; and
a diode formed by a pn junction between the second-conductivity-type poly-silicon layer and the first-conductivity-type poly-silicon layer, the diode including an anode pad and a cathode pad, the anode pad being electrically connected to and in direct contact with the second-conductivity-type poly-silicon layer, the cathode pad being electrically connected to the first-conductivity-type poly-silicon layer, wherein
the source pad is a metal film containing aluminum as a main constituent,
the anode pad is a metal film containing aluminum as a main constituent, the metal film of the anode pad being made of a single layer, being in direct contact with the second-conductivity-type poly-silicon layer and being free of any barrier metal, and
the gate pad is apart from the anode pad and the cathode pad in a plan view of the semiconductor device.