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Method of making a transistor having a source and a drain obtained by recrystallization of semiconductor

  • US 10,170,621 B2
  • Filed: 05/23/2017
  • Issued: 01/01/2019
  • Est. Priority Date: 05/24/2016
  • Status: Active Grant
First Claim
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1. Method of making a transistor, comprising:

  • forming a gate and a first dielectric spacer in contact with the side walls of the gate, on a first region of a first layer that will form the transistor channel, the first layer being a crystalline semiconducting layer;

    forming first portions of crystalline semiconductor on second regions of the first layer that will form part of the transistor source and drain;

    making at least the second regions of the first layer amorphous and doping them;

    recrystallizing at least the semiconductor in the second regions of the first layer and activating the dopants present at least in the semiconductor of the second regions of the first layer;

    removing the first portions;

    forming a second dielectric spacer in contact with the lateral walls of the gate such that the thickness of the second dielectric spacer is more than the thickness of the first dielectric spacer;

    forming second portions of doped crystalline semiconductor on the second regions of the first layer such that at least said second portions and the second regions of the first layer together form the source and drain of the transistor.

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