Semiconductor transistor device and method for manufacturing same
First Claim
1. A semiconductor device comprising:
- a drift layer of a first conductivity type;
a base layer of a second conductivity type provided on the drift layer;
a source layer of the first conductivity type selectively provided on a surface of the base layer;
a gate electrode contacting the source layer, the base layer, and the drift layer via a gate insulating;
a semiconductor layer of the second conductivity type connected to the base layer and extending into the drift layer;
a drain electrode electrically connected to the drift layer; and
a source electrode electrically connected to the source layer, wherein;
an impurity concentration of the first conductivity type contained in the base layer is lower than an impurity concentration of the first conductivity type contained in the drift layer;
the impurity concentration of the first conductivity type contained in the base layer is lower than an impurity concentration of the first conductivity type contained in the semiconductor layer; and
the impurity concentration of the first conductivity type contained in the drift layer is not less than 1×
1016 (atoms/cm3),an impurity concentration profile through the drift layer and the semiconductor layer along a first direction from the drain electrode toward the source electrode has a first portion in which impurity concentration of the first conductivity type is constant and not less than 1×
1016 (atoms/cm3) and a second portion in which impurity concentration of the first conductivity type is decreasing along the first direction from the drain electrode toward the source electrode and less than 1×
1016 (atoms/cm3),the first portion is between the second portion and the drain electrode along the first direction, andthe first portion extends for a first distance along the first direction and the second portion extends for a second distance along the first direction that is less than the first distance.
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Abstract
According to one embodiment, a semiconductor device includes a drift layer. The device includes a base layer. The device includes a source layer selectively provided on a surface of the base layer. The device includes a gate electrode provided via a gate insulating film in a trench penetrating the source layer and the base layer to reach the drift layer. The device includes a field plate electrode provided under the gate electrode in the trench. The device includes a drain electrode electrically connected to the drift layer. The device includes a source electrode. The field plate electrode is electrically connected to the source electrode. An impurity concentration of a first conductivity type contained in the base layer is lower than an impurity concentration of the first conductivity type contained in the drift layer. And the impurity concentration of the first conductivity type contained in the drift layer is not less than 1×1016 (atoms/cm3).
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Citations
6 Claims
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1. A semiconductor device comprising:
- a drift layer of a first conductivity type;
a base layer of a second conductivity type provided on the drift layer; a source layer of the first conductivity type selectively provided on a surface of the base layer; a gate electrode contacting the source layer, the base layer, and the drift layer via a gate insulating; a semiconductor layer of the second conductivity type connected to the base layer and extending into the drift layer; a drain electrode electrically connected to the drift layer; and a source electrode electrically connected to the source layer, wherein; an impurity concentration of the first conductivity type contained in the base layer is lower than an impurity concentration of the first conductivity type contained in the drift layer; the impurity concentration of the first conductivity type contained in the base layer is lower than an impurity concentration of the first conductivity type contained in the semiconductor layer; and the impurity concentration of the first conductivity type contained in the drift layer is not less than 1×
1016 (atoms/cm3),an impurity concentration profile through the drift layer and the semiconductor layer along a first direction from the drain electrode toward the source electrode has a first portion in which impurity concentration of the first conductivity type is constant and not less than 1×
1016 (atoms/cm3) and a second portion in which impurity concentration of the first conductivity type is decreasing along the first direction from the drain electrode toward the source electrode and less than 1×
1016 (atoms/cm3),the first portion is between the second portion and the drain electrode along the first direction, and the first portion extends for a first distance along the first direction and the second portion extends for a second distance along the first direction that is less than the first distance. - View Dependent Claims (2, 3, 4, 5, 6)
- a drift layer of a first conductivity type;
Specification