Semiconductor power device having shielding electrode for improving breakdown voltage
First Claim
1. A semiconductor power device, comprising:
- a substrate;
an epitaxial layer, disposed on the substrate, wherein the epitaxial layer comprises at least a first trench and a second trench;
a gate structure disposed in the first trench, the gate structure comprising;
a shield electrode and a gate electrode, the shield electrode being disposed under the gate electrode; and
a gate dielectric layer, disposed on an upper sidewall of the first trench and between the gate electrode and the epitaxial layer;
a termination structure disposed in the second trench, the termination structure comprising;
a termination electrode, wherein the termination electrode and the shield electrode are connected to each other; and
a dielectric layer disposed between the termination electrode and a sidewall of the second trench; and
a body region disposed in the epitaxial layer, wherein the second trench is only surrounded by the body region.
1 Assignment
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Accused Products
Abstract
The present invention provides a semiconductor power device including a substrate, an epitaxial layer disposed on the substrate and having at least a first trench and a second trench, a gate structure disposed in the first trench, and a termination structure disposed in the second trench. The gate structure includes a gate electrode, a gate dielectric layer disposed on an upper sidewall of the first trench and between the gate electrode and the epitaxial laver, and a shield electrode disposed under the gate electrode. The termination structure includes a termination electrode and a dielectric layer disposed between the termination electrode and a sidewall of the second trench. The termination electrode and the shield electrode are connected to each other. In addition, a body region is disposed in the epitaxial layer, and the second trench is only surrounded by the body region.
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Citations
8 Claims
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1. A semiconductor power device, comprising:
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a substrate; an epitaxial layer, disposed on the substrate, wherein the epitaxial layer comprises at least a first trench and a second trench; a gate structure disposed in the first trench, the gate structure comprising; a shield electrode and a gate electrode, the shield electrode being disposed under the gate electrode; and a gate dielectric layer, disposed on an upper sidewall of the first trench and between the gate electrode and the epitaxial layer; a termination structure disposed in the second trench, the termination structure comprising; a termination electrode, wherein the termination electrode and the shield electrode are connected to each other; and a dielectric layer disposed between the termination electrode and a sidewall of the second trench; and a body region disposed in the epitaxial layer, wherein the second trench is only surrounded by the body region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification