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Trench-based power semiconductor devices with increased breakdown voltage characteristics

  • US 8,193,581 B2
  • Filed: 04/08/2009
  • Issued: 06/05/2012
  • Est. Priority Date: 12/08/2008
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • a first trench extending into a semiconductor region;

    a first dielectric layer lining opposing sidewalls of the first trench, the first dielectric layer being thicker along one of the opposing sidewalls than along the other;

    a gate electrode disposed in the first trench;

    a plurality of trenches extending into the semiconductor region, each of the plurality of trenches having opposing sidewalls lined with a dielectric layer and a gate electrode disposed between the sidewalls, the dielectric layer of each trench having the same thickness along the portions of both the opposing sidewalls that face the gate electrode;

    a second trench extending into the semiconductor region;

    a second dielectric layer lining opposing sidewalls of the second trench, the second dielectric layer being thicker along one of the opposing sidewalls of the second trench than along the other; and

    a gate electrode disposed in the second trench; and

    wherein the first and second trenches and the plurality of trenches are all stripe-shaped, and the plurality of trenches are disposed between the first and second trenches.

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