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Shielded gate MOSFET device with a funnel-shaped trench

  • US 8,816,431 B2
  • Filed: 03/09/2012
  • Issued: 08/26/2014
  • Est. Priority Date: 03/09/2012
  • Status: Active Grant
First Claim
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1. A metal-oxide-semiconductor field-effect transistor (MOSFET) device, comprising:

  • a funnel-shaped trench having a flared rim etched in a semiconductor substrate,the flared rim having an upper edge at a wider cross section trench opening at about a top surface of the semiconductor substrate and having a lower edge at a top opening of a narrower cross section trench body portion that terminates in the semiconductor substrate;

    a gate electrode disposed in the funnel-shaped trench on a gate dielectric layer formed on the flared rim, the gate electrode having a split structure with a first gate electrode portion being separated from a second gate electrode portion by an insulator material; and

    a source region, a gate region, and a drain region disposed in the semiconductor substrate,the gate region abutting a lower portion of the flared rim, the drain region abutting a sidewall of the narrower cross section trench body portion with a top of the drain region being aligned with a lower edge of the gate electrode.

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