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Vertical wrap-around-gate field-effect-transistor for high density, low voltage logic and memory array

  • US 8,138,039 B2
  • Filed: 03/25/2011
  • Issued: 03/20/2012
  • Est. Priority Date: 08/30/2004
  • Status: Active Grant
First Claim
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1. A method of fabricating a vertical semiconductor transistor, said method comprises:

  • providing a semiconductor substrate;

    forming a polysilicon pillar on the substrate;

    using the thickness of a first film layer to define a first source/drain region of the transistor as the top portion of the pillar;

    forming a spacer layer around the top portion of the pillar;

    using the thickness of a second film layer to define a channel region of the transistor as the central portion of the pillar and to align a transistor gate with the channel region of the transistor;

    depositing a dielectric layer on the pillar in alignment with the channel region of the transistor;

    forming the transistor gate in alignment with the channel region of the transistor, wherein the transistor gate is formed to surround the pillar with the dielectric layer between a conductive material and the pillar;

    using the thickness of the spacer layer around the top portion of the pillar to define the thickness of the transistor gate, a top portion of the transistor gate being underneath a bottom portion of the spacer layer; and

    defining a second source/drain region of the transistor as the bottom portion of the pillar using the thickness of a third film layer.

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