SEMICONDUCTOR DEVICE
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Abstract
A first semiconductor layer extends from the element region to the element-termination region, and functions as a drain of the MOS transistor. A second semiconductor layer extends, below the first semiconductor layer, from the element region to the element-termination region. A third semiconductor layer extends from the element region to the element-termination region, and is in contact with the second semiconductor layer to function as a drift layer of the MOS transistor. A distance between a boundary between the first semiconductor layer and the field oxide film, and the end portion of the third semiconductor layer on the fifth semiconductor layer side in the element region is smaller than that between a boundary between the first semiconductor layer and the field oxide layer and an end portion of the third semiconductor layer on the fifth semiconductor layer side in the element-termination region.
46 Citations
40 Claims
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1-20. -20. (canceled)
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21. A semiconductor device, comprising:
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a semiconductor substrate; a source layer formed on the semiconductor substrate; and a drain layer formed on the semiconductor substrate, the drain layer being formed to face the source layer in a first direction with a channel region and a drift layer therebetween, and the drain layer being formed to extend in a second direction orthogonal to the first direction; wherein a distance along the first direction from the drain layer to an edge of the drift layer on a side of the source layer is larger in an end portion of the drain layer than in a center of the drain layer in the second direction. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A semiconductor device, comprising:
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a semiconductor substrate; a source layer formed on the semiconductor substrate; and a drain layer formed on the semiconductor substrate, the drain layer being formed to face the source layer in a first direction with a channel region therebetween, and the drain layer being formed to extend in a second direction orthogonal to the first direction; and a gate electrode formed on the channel region via an insulating film to surround the drain layer, wherein a distance along the first direction from the drain layer to an edge of the gate electrode is larger in an end portion of the drain layer than in a center of the drain layer in the second direction. - View Dependent Claims (30, 31)
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32. A semiconductor device, comprising:
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a semiconductor substrate; a source layer formed on the semiconductor substrate; and a drain layer formed on the semiconductor substrate, the drain layer being formed to face the source layer in a first direction with a channel region and a drift layer therebetween, and the drain layer being formed to extend in a second direction orthogonal to the first direction, wherein the drift layer is formed to surround the drain layer, and includes a first part in the vicinity of the center of the drain layer and a second part in the vicinity of the end portion of the drain layer, the second part being enlarged compared to the first part. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A semiconductor device, comprising:
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a semiconductor substrate; a source layer formed on the semiconductor substrate; and a drain layer formed on the semiconductor substrate, the drain layer being formed to face the source layer in a first direction with a channel region therebetween, and the drain layer being formed to extend in a second direction orthogonal to the first direction; and a gate electrode formed on the channel region via an insulating film to surround the drain layer, wherein the gate electrode is formed to surround the drain layer, and includes a first part in the vicinity of the center of the drain layer and a second part in the vicinity of the end portion of the drain layer, an area surrounded by the second part is larger than that surrounded by the first part. - View Dependent Claims (40)
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Specification