Semiconductor device having breakdown voltage limiter regions
First Claim
1. A semiconductor device comprising:
- a semiconductor chip having a first major surface and a second major surface facing opposite to the first major surface;
a first main electrode on the first major surface;
a second main electrode on the second major surface;
an active region in electrical contact with the first main electrode; and
a layer with low electrical resistance in electrical contact with the second main electrode;
an alternating-conductivity-type drain drift layer between the active region and the layer with low electrical resistance;
wherein the alternating-conductivity-type drain drift layer comprises first semiconductor regions of a first conductivity type and second semiconductor regions of a second conductivity type;
wherein the first semiconductor regions and the second semiconductor regions are arranged alternately with each other; and
wherein the alternating-conductivity-type drain drift layer further includes breakdown voltage limiter regions of the second conductivity type in the second semiconductor regions having a higher impurity concentration than adjacent portions of the first conductivity type in the first semiconductor regions.
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Accused Products
Abstract
A semiconductor device facilitates preventing hot carriers from being injected into the insulation film so that the characteristics and the reliability of the active region thereof may not be impaired. The device includes an alternating-conductivity-type drain including heavily doped p-type breakdown voltage limiter regions in the portions of p-type partition regions in contact with the well bottoms of p-type base regions. Since the electric field in the central portion of breakdown voltage limiter regions reaches the critical value in advance to the electric field at the points E beneath gate insulation films the electric field at the points E is relaxed and hot carrier injection into gate insulation films is prevented.
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Citations
10 Claims
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1. A semiconductor device comprising:
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a semiconductor chip having a first major surface and a second major surface facing opposite to the first major surface;
a first main electrode on the first major surface;
a second main electrode on the second major surface;
an active region in electrical contact with the first main electrode; and
a layer with low electrical resistance in electrical contact with the second main electrode;
an alternating-conductivity-type drain drift layer between the active region and the layer with low electrical resistance;
wherein the alternating-conductivity-type drain drift layer comprises first semiconductor regions of a first conductivity type and second semiconductor regions of a second conductivity type;
wherein the first semiconductor regions and the second semiconductor regions are arranged alternately with each other; and
wherein the alternating-conductivity-type drain drift layer further includes breakdown voltage limiter regions of the second conductivity type in the second semiconductor regions having a higher impurity concentration than adjacent portions of the first conductivity type in the first semiconductor regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification