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Method for providing a gate metal layer of a transistor device and associated transistor

  • US 9,202,695 B2
  • Filed: 05/07/2014
  • Issued: 12/01/2015
  • Est. Priority Date: 05/07/2013
  • Status: Active Grant
First Claim
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1. A method for manufacturing a field effect transistor, the method comprising the steps of:

  • providing a dummy gate structure on a substrate, the dummy gate structure comprising a gate dielectric layer, the dummy gate structure being laterally defined by a gate trench defined by inner sidewalls of a set of spacers;

    laterally embedding the dummy gate structure by one or more embedding layers, the one or more embedding layers defining a front surface;

    andproviding a final gate electrode layer in between the inner sidewalls of the set of spacers;

    and wherein providing the final gate electrode layer further comprises;

    providing a diffusion layer, the diffusion layer extending at least on top of the gate dielectric layer, on inner sidewalls of the set of spacers, and on at least a portion of the front surface;

    providing a metal layer including a metal on top of a portion of the diffusion layer that is disposed over the front surface, and whereby the metal does not enter the gate trench;

    applying an anneal step, the anneal step being adapted for driving diffusion of the metal of the metal layer into the diffusion layer, and for further diffusing the metal in the diffusion layer towards the portion of the diffusion layer in the area corresponding to the area of the gate dielectric; and

    filling the area in between the inner sidewalls of the set of spacers with a final gate metal filling layer.

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