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Fin field effect transistor (FinFET) device structure and method for forming the same

  • US 10,262,870 B2
  • Filed: 11/16/2015
  • Issued: 04/16/2019
  • Est. Priority Date: 07/02/2015
  • Status: Active Grant
First Claim
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1. A fin field effect transistor (FinFET) device structure, comprising:

  • a fin structure formed over a substrate;

    a gate structure traversing over the fin structure, wherein the gate structure comprises a gate electrode layer which comprises an upper portion above the fin structure, a lower portion below a top surface of the fin structure, and a bottom portion adjacent to an isolation structure, the upper portion has a top surface with a first width, and the lower portion has a bottom surface with a second width, and the first width is greater than the second width, wherein the top surface is planar and extends from one side of the gate structure to an opposite side of the gate;

    structure, wherein the bottom portion has a third width greater than the second width, and a spacer adjacent to the gate structure, wherein a surface of the spacer facing away from the gate structure conforms to a shape of a sidewall of the gate structure from a first surface of the spacer facing the substrate to a second surface of the spacer opposite the first surface.

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