Semiconductor device and method of manufacturing the same
First Claim
1. A semiconductor device comprising:
- a semiconductor substrate having a first surface and a second surface that is an opposite surface of the first surface;
a drain region which is arranged in the semiconductor substrate and has a first conductivity type;
a drift region which is arranged on a side of the drain region facing the first surface in the semiconductor substrate and has the first conductivity type;
a base region which is arranged on a side of the drift region facing the first surface in the semiconductor substrate and has a second conductivity type opposite to the first conductivity type;
a source region which is arranged on a side of the base region facing the first surface so that the base region is sandwiched between the source region and the drift region in the semiconductor substrate and which has the first conductivity type;
a gate electrode which faces a part of the base region sandwiched between the source region and the drift region while being insulated from the part of the base region;
an interlayer insulating film which is arranged over the first surface;
a conductive layer which is arranged in the interlayer insulating film and is electrically coupled to the drain region;
a wiring line which is arranged over the interlayer insulating film; and
a contact plug which is arranged in the interlayer insulating film and is electrically coupled to the wiring line and the source region,wherein the interlayer insulating film has an intermediate interlayer insulating film arranged between the conductive layer and the contact plug,wherein the conductive layer is formed of a conductor which changes into an insulator when being oxidized, andwherein the intermediate interlayer insulating film is a thermal oxide film of a material that forms the conductive layer.
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Abstract
The present invention provides a semiconductor device that can reduce effects of noise without complicating processes or increasing chip area.
The semiconductor device according to an aspect of the present invention includes a semiconductor substrate, a drain region, a drift region, a base region, a source region, a gate electrode, an interlayer insulating film, a conductive layer electrically coupled to the drain region, a wiring line, and a contact plug electrically coupled to the source region and the wiring line. The interlayer insulating film has an intermediate interlayer insulating film. The intermediate interlayer insulating film is arranged between the conductive layer and the contact plug. The intermediate interlayer insulating film is a thermal oxide film of a material that forms the conductive layer.
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Citations
12 Claims
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1. A semiconductor device comprising:
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a semiconductor substrate having a first surface and a second surface that is an opposite surface of the first surface; a drain region which is arranged in the semiconductor substrate and has a first conductivity type; a drift region which is arranged on a side of the drain region facing the first surface in the semiconductor substrate and has the first conductivity type; a base region which is arranged on a side of the drift region facing the first surface in the semiconductor substrate and has a second conductivity type opposite to the first conductivity type; a source region which is arranged on a side of the base region facing the first surface so that the base region is sandwiched between the source region and the drift region in the semiconductor substrate and which has the first conductivity type; a gate electrode which faces a part of the base region sandwiched between the source region and the drift region while being insulated from the part of the base region; an interlayer insulating film which is arranged over the first surface; a conductive layer which is arranged in the interlayer insulating film and is electrically coupled to the drain region; a wiring line which is arranged over the interlayer insulating film; and a contact plug which is arranged in the interlayer insulating film and is electrically coupled to the wiring line and the source region, wherein the interlayer insulating film has an intermediate interlayer insulating film arranged between the conductive layer and the contact plug, wherein the conductive layer is formed of a conductor which changes into an insulator when being oxidized, and wherein the intermediate interlayer insulating film is a thermal oxide film of a material that forms the conductive layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a semiconductor device, the method comprising the step of:
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preparing a semiconductor substrate having a first surface and a second surface that is a surface opposite to the first surface, wherein in the semiconductor substrate, a drain region which has a first conductivity type, a drift region which is arranged on a side of the drain region facing the first surface and has the first conductivity type, a base region which is arranged on a side of the drift region facing the first surface and has a second conductivity type opposite to the first conductivity type, and a source region which is arranged on a side of the base region facing the first surface so that the base region is sandwiched between the source region and the drift region and which has the first conductivity type, are formed, and wherein the method further includes the steps of forming a gate electrode which faces a part of the base region sandwiched between the source region and the drift region while being insulated from the part of the base region, forming a lower interlayer insulating film over the first surface, forming a conductive layer over the lower interlayer insulating film, forming an upper interlayer insulating film over the conductive layer, forming a mask having an opening over the upper interlayer insulating film, forming an upper contact hole that penetrates the upper interlayer insulating film and the conductive layer by etching the upper interlayer insulating film and the conductive layer through the opening and exposing the conductive layer from a side wall of the contact hole, and forming an intermediate interlayer insulating film by thermally oxidizing the conductive layer exposed from the side wall. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification