Patent ID: 9685334
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A method for controlling dopant diffusion to a semiconductor fin having a first portion, the method comprising: depositing a carbon-containing layer over a second portion of the semiconductor fin adjacent to the gate, the second portion distinct from the first portion; first annealing to diffuse carbon from the carbon-containing layer into at least the second portion of the semiconductor fin; removing the carbon-containing layer over the second portion of the semiconductor fin; growing a dopant-containing epitaxial layer over the second portion of the semiconductor fin; and second annealing to diffuse dopant from the dopant-containing epitaxial layer into at least the second portion of the semiconductor fin, the carbon in the second portion of the semiconductor fin limiting diffusion of the dopant into at least the second portion of the semiconductor fin.