Semiconductor device
First Claim
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1. A semiconductor device, comprising:
- a semiconductor layer made of SiC, the semiconductor layer having a front surface and a back surface;
a gate trench formed in a surface portion of the semiconductor layer;
a gate insulating film formed on an inner surface of the gate trench;
a gate electrode embedded in the gate trench and on the gate insulating film;
a body region of a second conductivity type formed in the semiconductor layer and defining one part of a side surface of the gate trench;
a source region of a first conductivity type formed on a front surface side of the body region in the semiconductor layer;
a source trench penetrating the source region from the front surface of the semiconductor layer;
a gate pad formed over a part of the semiconductor layer; and
a source conductive member covering most of the semiconductor device except the gate pad in a plan view, whereinthe source conductive member is in contact with the gate insulating film, the source region and an inner surface of the source trench,the source conductive member includes a first layer and a second layer on the first layer such that an interface between the first layer and the second layer is positioned both inside and outside the source trench,the body region includes a body contact region formed on a side surface of the source trench,the source conductive member is in contact with the body contact region in the source trench,the body contact region is covered with the source region from the front surface side of the semiconductor layer, andthe body contact region is not exposed from the front surface of the semiconductor layer.
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Abstract
A semiconductor device includes a semiconductor layer made of SiC. A transistor element having an impurity region is formed in a front surface portion of the semiconductor layer. A first contact wiring is formed on a back surface portion of the semiconductor layer, and defines one electrode electrically connected to the transistor element. The first contact wiring has a first wiring layer forming an ohmic contact with the semiconductor layer without a silicide contact and a second wiring layer formed on the first wiring layer and having a resistivity lower than that of the first wiring layer.
107 Citations
22 Claims
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1. A semiconductor device, comprising:
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a semiconductor layer made of SiC, the semiconductor layer having a front surface and a back surface; a gate trench formed in a surface portion of the semiconductor layer; a gate insulating film formed on an inner surface of the gate trench; a gate electrode embedded in the gate trench and on the gate insulating film; a body region of a second conductivity type formed in the semiconductor layer and defining one part of a side surface of the gate trench; a source region of a first conductivity type formed on a front surface side of the body region in the semiconductor layer; a source trench penetrating the source region from the front surface of the semiconductor layer; a gate pad formed over a part of the semiconductor layer; and a source conductive member covering most of the semiconductor device except the gate pad in a plan view, wherein the source conductive member is in contact with the gate insulating film, the source region and an inner surface of the source trench, the source conductive member includes a first layer and a second layer on the first layer such that an interface between the first layer and the second layer is positioned both inside and outside the source trench, the body region includes a body contact region formed on a side surface of the source trench, the source conductive member is in contact with the body contact region in the source trench, the body contact region is covered with the source region from the front surface side of the semiconductor layer, and the body contact region is not exposed from the front surface of the semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification