Power semiconductor device having different gate crossings, and method for manufacturing thereof
First Claim
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1. A power semiconductor device, comprising:
- a semiconductor substrate having a first side;
a plurality of active transistor cells formed in an active area of the semiconductor substrate, each of the plurality of active transistor cells comprising a spicular trench which extends from the first side into the semiconductor substrate and comprises a field electrode; and
a gate electrode structure comprising a plurality of intersecting gate trenches running between the spicular trenches,wherein the plurality of intersecting gate trenches comprises a plurality of first gate crossing regions and a plurality of second gate crossing regions, each of the first gate crossing regions comprising a first wall section, each of the second gate crossing regions comprising a second wall section,wherein the first wall section forms a transition that joins two transverse gate trench spans together,wherein the second wall section forms a transition that joins two transverse gate trench spans together,wherein when seen in a plan projection onto the first side of the semiconductor substrate, the first wall section has a first radius and the second wall section has a second radius that is different from the first radius.
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Abstract
A power semiconductor device includes a semiconductor substrate having a first side. A plurality of active transistor cells is formed in an active area of the semiconductor substrate. Each of the plurality of active transistor cells includes a spicular trench which extends from the first side into the semiconductor substrate and has a field electrode. A gate electrode structure has a plurality of intersecting gate trenches running between the spicular trenches. The intersecting gate trenches form gate crossing regions of different shape when seen in a plan projection onto the first side of the power semiconductor device.
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14 Claims
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1. A power semiconductor device, comprising:
- a semiconductor substrate having a first side;
a plurality of active transistor cells formed in an active area of the semiconductor substrate, each of the plurality of active transistor cells comprising a spicular trench which extends from the first side into the semiconductor substrate and comprises a field electrode; and a gate electrode structure comprising a plurality of intersecting gate trenches running between the spicular trenches, wherein the plurality of intersecting gate trenches comprises a plurality of first gate crossing regions and a plurality of second gate crossing regions, each of the first gate crossing regions comprising a first wall section, each of the second gate crossing regions comprising a second wall section, wherein the first wall section forms a transition that joins two transverse gate trench spans together, wherein the second wall section forms a transition that joins two transverse gate trench spans together, wherein when seen in a plan projection onto the first side of the semiconductor substrate, the first wall section has a first radius and the second wall section has a second radius that is different from the first radius. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a semiconductor substrate having a first side;
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11. A power semiconductor device, comprising:
- a semiconductor substrate having a first side and an active area;
a plurality of spaced apart spicular trenches in the active area and extending from the first side into the semiconductor substrate, each of the spicular trenches comprising a field electrode; and a plurality of intersecting gate trenches between adjacent spicular trenches, wherein, when seen in a plan projection onto the first side, the plurality of the intersecting gate trenches form a grid structure with a plurality of grid meshes to surround respective spicular trenches, wherein the gate trenches comprise respective gate electrodes, are adjacent to body regions and define channel regions in the body regions, wherein a respective channel region completely surrounds a respective spicular trench when seen in the plan projection onto the first side of the semiconductor substrate, wherein at a first one of the grid meshes, a first wall section of the gate trenches joins transverse spans of the gate trenches together, wherein at a second one of the grid meshes, a second wall section of the gate trenches joins transverse spans of the gate trenches together, wherein the wall section has a different shape as the second wall section when seen in plan projection onto the first side, and wherein the plurality of grid meshes comprises first grid meshes having a substantially round boundary and second grid meshes having a partially straight boundary, wherein a percentage ratio of straight span length to curved span length in an enclosed boundary formed by the first grid meshes is greater than a percentage ratio of straight span length to curved span length formed by the second grid meshes. - View Dependent Claims (12, 13, 14)
- a semiconductor substrate having a first side and an active area;
Specification