STRUCTURE AND METHOD FOR FORMING A SHIELDED GATE TRENCH FET WITH THE SHIELD AND GATE ELECTRODES BEING CONNECTED TOGETHER
First Claim
Patent Images
1. A field effect transistor (FET) comprising:
- a trench extending into a semiconductor region;
a shield electrode in a lower portion of the trench, the shield electrode being insulated from the semiconductor region by a shield dielectric;
an inter-electrode dielectric (IED) over the shield electrode; and
a gate electrode in an upper portion of the trench over the IED, the gate electrode being insulated from the semiconductor region by a gate dielectric, wherein the shield electrode is electrically connected to the gate electrode,wherein the trench extends in an active region of the FET, the shield electrode and gate electrode extending out of the trench and into a non-active region of the FET where the shield electrode and gate electrode are electrically connected together by a first interconnect layer.
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Abstract
A field effect transistor (FET) includes a plurality of trenches extending into a semiconductor region. Each trench includes a gate electrode and a shield electrode with an inter-electrode dielectric therebetween, wherein the shield electrode and the gate electrode are electrically connected together.
45 Citations
21 Claims
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1. A field effect transistor (FET) comprising:
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a trench extending into a semiconductor region; a shield electrode in a lower portion of the trench, the shield electrode being insulated from the semiconductor region by a shield dielectric; an inter-electrode dielectric (IED) over the shield electrode; and a gate electrode in an upper portion of the trench over the IED, the gate electrode being insulated from the semiconductor region by a gate dielectric, wherein the shield electrode is electrically connected to the gate electrode, wherein the trench extends in an active region of the FET, the shield electrode and gate electrode extending out of the trench and into a non-active region of the FET where the shield electrode and gate electrode are electrically connected together by a first interconnect layer. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
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6. (canceled)
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12. A field effect transistor (FET) in a semiconductor die comprising:
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an active region housing active cells; a non-active region with no active cells therein; a drift region of a first conductivity type; a body region of a second conductivity type over the drift region; and a plurality of trenches extending through the body region and into the drift region, each trench including a shield electrode and a gate electrode, the shield electrode being disposed below the gate electrode; wherein the shield electrode and the gate electrode extend out of each trench and into the non-active region where the shield electrode and gate electrode are electrically connected together by a gate interconnect layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A field effect transistor (FET) comprising a plurality of trenches extending into a semiconductor region, each trench having a gate electrode and a shield electrode with an inter-electrode dielectric therebetween, wherein the shield electrode and the gate electrode are electrically connected together in a non-active region of the FET.
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21-30. -30. (canceled)
Specification