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MOSFET WITH VERTICAL VARIATION OF GATE-PILLAR SEPARATION

  • US 20190081147A1
  • Filed: 09/13/2017
  • Published: 03/14/2019
  • Est. Priority Date: 09/13/2017
  • Status: Abandoned Application
First Claim
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1. A trench Metal-Oxide-Semiconductor Field-effect Transistor (MOSFET) comprising:

  • a semiconductor die including a substrate, an active device region formed upon the substrate, and an interconnection region formed upon the active device region, the active device region and the interconnection region separated by an interface surface;

    a pair of trenches formed in the active device region, each of the pair of trenches extending from the interface surface to a dielectric trench bottom, the trenches laterally separated from one another by an intervening semiconductor pillar;

    a conductive gate located within each of the trenches and separated, by a gate dielectric, from the intervening semiconductor pillar by a gate-pillar separation distance, wherein the gate-pillar separation distance decreases from a first depth location corresponding to the top of the conductive gate to a second depth location below the first depth location;

    a conductive field plate located within each of the trenches, the conductive field plate located below the conductive gate and vertically separated from the conductive gate by an intervening dielectric, the conductive field plate laterally separated from the intervening semiconductor pillar by a dielectric material;

    a source region in the intervening semiconductor pillar, the source region abutting each of the trenches;

    a body region in the intervening semiconductor pillar, the body region abutting each of the trenches below the first depth location; and

    a drift region in the semiconductor pillar contiguously extending from the body region to a drain region therebelow.

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