Semiconductor device
First Claim
1. A semiconductor device comprising:
- a first semiconductor region of a first conductivity type;
a second semiconductor region of a second conductivity type arranged on the first semiconductor region;
a third semiconductor region of the first conductivity type arranged on the second semiconductor region;
a fourth semiconductor region of a second conductivity type arranged on the third semiconductor region;
a groove extending from a top surface of the fourth semiconductor region and reaching the second semiconductor region through the fourth semiconductor region and the third semiconductor region;
an insulation film arranged on an inner wall of the groove,a control electrode arranged on the insulation film at a side surface of the groove, the control electrode facing the third semiconductor region;
a connection groove connected to ends of the groove, the connection groove extending from the top surface of the fourth semiconductor region and reaching the second semiconductor region through the fourth semiconductor region and the third semiconductor region;
a first main electrode electrically connected to the first semiconductor region,a second main electrode electrically connected to the fourth semiconductor region; and
a bottom electrode arranged on the insulation film at a bottom surface of the groove and spaced from the control electrode,wherein—
the bottom electrode comprises a body arranged at the bottom surface of the groove and a connection portion electrically connected to the main body,in plan view, the body is formed in a strip form, and extends in an extending direction of the groove, and the connection portion extends in a depth direction of the groove and is connected to an end of the body in the extending direction of the body,the body of the bottom electrode is arranged in the groove, and the connection portion of the bottom electrode is arranged in the connection groove, andin plan view, a length of the groove in the extending direction of the groove is larger than a width of the groove, and the width of the groove is larger than a gap between the groove and an adjacent groove.
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Accused Products
Abstract
A semiconductor device is disclosed that comprises semiconductor regions and an insulating film. A groove extends from a top surface of a semiconductor region and reaching a semiconductor region. In plan view, a body of a bottom electrode is formed in a strip form, and extends in an extending direction of the groove, and the connection portion extends in a depth direction of the groove and is connected to an end of the body in the extending direction of the body. The body of the bottom electrode is arranged in the groove, and the connection portion of the bottom electrode is arranged in the connection groove. In plan view, a length of the groove in the extending direction of the groove is larger than a width of the groove, and the width of the groove is larger than a gap between the groove and an adjacent groove.
13 Citations
13 Claims
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1. A semiconductor device comprising:
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a first semiconductor region of a first conductivity type; a second semiconductor region of a second conductivity type arranged on the first semiconductor region; a third semiconductor region of the first conductivity type arranged on the second semiconductor region; a fourth semiconductor region of a second conductivity type arranged on the third semiconductor region; a groove extending from a top surface of the fourth semiconductor region and reaching the second semiconductor region through the fourth semiconductor region and the third semiconductor region; an insulation film arranged on an inner wall of the groove, a control electrode arranged on the insulation film at a side surface of the groove, the control electrode facing the third semiconductor region; a connection groove connected to ends of the groove, the connection groove extending from the top surface of the fourth semiconductor region and reaching the second semiconductor region through the fourth semiconductor region and the third semiconductor region; a first main electrode electrically connected to the first semiconductor region, a second main electrode electrically connected to the fourth semiconductor region; and a bottom electrode arranged on the insulation film at a bottom surface of the groove and spaced from the control electrode, wherein— the bottom electrode comprises a body arranged at the bottom surface of the groove and a connection portion electrically connected to the main body, in plan view, the body is formed in a strip form, and extends in an extending direction of the groove, and the connection portion extends in a depth direction of the groove and is connected to an end of the body in the extending direction of the body, the body of the bottom electrode is arranged in the groove, and the connection portion of the bottom electrode is arranged in the connection groove, and in plan view, a length of the groove in the extending direction of the groove is larger than a width of the groove, and the width of the groove is larger than a gap between the groove and an adjacent groove. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11)
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7. A semiconductor device comprising:
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a groove formed on a front surface of a semiconductor substrate; a gate electrode arranged in contact with an oxide film formed on an inner surface of the groove; a first main electrode formed on the front surface of the semiconductor substrate; and a second main electrode formed on a back surface of the semiconductor substrate; switching of an operating current flowing between the first main electrode and the second main electrode being controlled by a voltage applied to the gate electrode, wherein the gate electrode is at least partially removed from a bottom surface of the groove, a bottom electrode separated from the gate electrode is arranged on a portion of the oxide film at the bottom surface of the groove from which the gate electrode is removed, the bottom electrode is electrically connected to the first main electrode, and in plan view, a body of the bottom electrode is arranged in the groove, and a connection portion of the bottom electrode is arranged in a connection groove, and each control electrode extends in the groove, in an extending direction of the groove, beyond the connection portion of the bottom electrode and is raised outside of the groove. - View Dependent Claims (8)
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12. A semiconductor device comprising:
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a groove formed on a front surface of a semiconductor substrate; a gate electrode arranged in contact with an oxide film formed on an inner surface of the groove; a first main electrode formed on the front surface of the semiconductor substrate; and a second main electrode formed on a back surface of the semiconductor substrate; wherein switching of an operating current flowing between the first main electrode and the second main electrode is controlled by a voltage applied to the gate electrode, the gate electrode is at least partially removed from a bottom surface of the groove, a bottom electrode separated from the gate electrode is arranged on a portion of the oxide film at the bottom surface of the groove from which the gate electrode is removed, the bottom electrode is electrically connected to the first main electrode via a connection portion of the bottom electrode, and a dimension of an extending portion of the gate electrode in the depth direction of the groove is smaller than a dimension of the gate electrode in the depth direction of the groove, the extending portion of the gate electrode facing the connection portion of the bottom electrode. - View Dependent Claims (13)
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Specification