Trench type power transistor device
First Claim
1. A trench type power transistor device, comprising:
- a semiconductor substrate of a first conductivity type, having an active region and a peripheral region, and the semiconductor substrate having at least one first trench;
at least one transistor cell, disposed in the active region, and the transistor cell comprising;
a first gate conductive layer, disposed in the first trench;
a gate insulating layer, disposed in the first trench and between the first gate conductive layer and the semiconductor substrate;
a doped body region of a second conductivity type, disposed in the semiconductor substrate at a side of the first trench; and
a doped source region of the first conductivity type, disposed in the doped body region;
a gate metal layer, disposed on the semiconductor substrate in the peripheral region;
a source metal layer, disposed on the semiconductor substrate in the active region; and
a second gate conductive layer, disposed between the first gate conductive layer and the source metal layer, and the second gate conductive layer partially overlapping the first gate conductive layer and the source metal layer in a direction perpendicular to the semiconductor substrate, wherein the second gate conductive layer electrically connects the first gate conductive layer to the gate metal layer, and the second gate conductive layer is electrically insulated from the source metal layer and the semiconductor substrate.
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Abstract
The present invention provides a trench type power transistor device including a semiconductor substrate, at least one transistor cell, a gate metal layer, a source metal layer, and a second gate conductive layer. The semiconductor substrate has at least one trench. The transistor cell includes a first gate conductive layer disposed in the trench. The gate metal layer and the source metal layer are disposed on the semiconductor substrate. The second gate conductive layer is disposed between the first gate conductive layer and the source metal layer. The second gate conductive layer electrically connects the first gate conductive layer to the gate metal layer, and the second gate conductive layer is electrically insulated from the source metal layer and the semiconductor substrate.
9 Citations
12 Claims
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1. A trench type power transistor device, comprising:
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a semiconductor substrate of a first conductivity type, having an active region and a peripheral region, and the semiconductor substrate having at least one first trench; at least one transistor cell, disposed in the active region, and the transistor cell comprising; a first gate conductive layer, disposed in the first trench; a gate insulating layer, disposed in the first trench and between the first gate conductive layer and the semiconductor substrate; a doped body region of a second conductivity type, disposed in the semiconductor substrate at a side of the first trench; and a doped source region of the first conductivity type, disposed in the doped body region; a gate metal layer, disposed on the semiconductor substrate in the peripheral region; a source metal layer, disposed on the semiconductor substrate in the active region; and a second gate conductive layer, disposed between the first gate conductive layer and the source metal layer, and the second gate conductive layer partially overlapping the first gate conductive layer and the source metal layer in a direction perpendicular to the semiconductor substrate, wherein the second gate conductive layer electrically connects the first gate conductive layer to the gate metal layer, and the second gate conductive layer is electrically insulated from the source metal layer and the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification