Insulated gate semiconductor device structure
First Claim
Patent Images
1. A semiconductor device comprising:
- a region of semiconductor material having a major surface;
a trench extending from the major surface;
a first layer overlying surfaces of the trench;
a second layer adjacent the first layer, where the second layer comprises a material different than the first layer, and where the second layer is disposed in a lower portion of the trench and not an upper portion of the trench, and where the second layer is discontinuous in proximity to a lower surface of the trench;
a first region comprising a material different than the second layer in proximity to the lower surface of the trench;
a first electrode in the lower portion of the trench and adjacent portions of the second layer and the first region, where portions of the first layer are between the first electrode and the region of semiconductor material;
a dielectric layer above the first electrode; and
a second electrode adjacent the first layer and the dielectric layer, where at least a portion of the second electrode is within the trench.
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Accused Products
Abstract
In one embodiment, a vertical insulated-gate field effect transistor includes a shield electrode formed in trench structure within a semiconductor material. A gate electrode is isolated from the semiconductor material using gate insulating layers. Before the shield electrode is formed, spacer layers can be used form shield insulating layers along portions of the trench structure. The shield insulating layers are thicker than the gate insulating layers. In another embodiment, the shield insulating layers have variable thickness.
18 Citations
23 Claims
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1. A semiconductor device comprising:
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a region of semiconductor material having a major surface; a trench extending from the major surface; a first layer overlying surfaces of the trench; a second layer adjacent the first layer, where the second layer comprises a material different than the first layer, and where the second layer is disposed in a lower portion of the trench and not an upper portion of the trench, and where the second layer is discontinuous in proximity to a lower surface of the trench; a first region comprising a material different than the second layer in proximity to the lower surface of the trench; a first electrode in the lower portion of the trench and adjacent portions of the second layer and the first region, where portions of the first layer are between the first electrode and the region of semiconductor material; a dielectric layer above the first electrode; and a second electrode adjacent the first layer and the dielectric layer, where at least a portion of the second electrode is within the trench. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device structure comprising:
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a trench extending into a semiconductor region; a shield electrode disposed in a lower portion of the trench; a first dielectric layer disposed in both the lower portion of the trench and an upper portion of the trench and disposed, at least in part, between a second dielectric layer and the semiconductor region; the second dielectric layer disposed, at least in part, between the first dielectric layer and a third dielectric layer, and disposed in the lower portion of the trench but not disposed in the upper portion of the trench, wherein the second dielectric layer is discontinuous in proximity to a lower surface of the trench; the third dielectric layer disposed in the lower portion of the trench and not disposed in the upper portion of the trench; and a fourth dielectric layer disposed between the shield electrode and a gate electrode, the gate electrode being disposed in the upper portion of the trench. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A semiconductor device comprising:
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a region of semiconductor material having a major surface; a trench extending from the major surface into the region of semiconductor material; a first dielectric layer overlying surfaces of the trench; a second dielectric layer adjacent the first dielectric layer, where the second dielectric layer comprises a material different than the first dielectric layer, and where the second dielectric layer is disposed in a lower portion of the trench and not an upper portion of the trench, and where the second dielectric layer is discontinuous in proximity to a lower surface of the trench; a first electrode in the lower portion of the trench and adjacent portions of the second dielectric layer and the first region, where portions of the first dielectric layer are between the first electrode and the region of semiconductor material; a third dielectric layer above the first electrode; and a second electrode adjacent the first dielectric layer and the third dielectric layer, where at least a portion of the second electrode is within the trench. - View Dependent Claims (21, 22, 23)
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Specification