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METHOD OF FORMING SHAPED SOURCE/DRAIN EPITAXIAL LAYERS OF A SEMICONDUCTOR DEVICE

  • US 20200135903A1
  • Filed: 12/23/2019
  • Published: 04/30/2020
  • Est. Priority Date: 06/30/2017
  • Status: Active Grant
First Claim
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1. A semiconductor device, comprising:

  • a fin field-effect-transistor (Fin FET) device including;

    a fin structure protruding from a substrate layer in a first direction and extending in a second direction perpendicular to the first direction;

    a source/drain (SD) epitaxial structure disposed on the fin structure;

    a gate stack including a gate electrode layer and a gate dielectric layer, covering a portion of the fin structure and extending in the second direction; and

    a dielectric layer over sidewalls of the fin structure in a region of the SD epitaxial structure not covered by the gate stack, wherein the dielectric layer extends an entire length of the region of the SD epitaxial structure in the second direction, and wherein the SD epitaxial structure has a diamond shape top with limited lateral growth in the second direction and including flat side surfaces parallel to the first direction, and wherein an extent of the SD epitaxial structure in the second direction is limited to about outer sidewalls of the dielectric layer in the region of the SD epitaxial structure, the outer sidewalls of the dielectric layer are further away from the SD epitaxial structure.

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