Patent ID: 9647123
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A semiconductor structure comprising: a bottom source/drain semiconductor material layer located above a base semiconductor substrate; an epitaxial semiconductor channel material structure extending upward from a topmost surface of the bottom source/drain semiconductor material layer, the epitaxial semiconductor channel material structure comprises, from bottom to top, a first region of an epitaxial semiconductor channel material having a faceted top surface, a second region of the epitaxial semiconductor channel material having a bottom faceted surface, and a third region of the epitaxial semiconductor channel material; a functional gate structure located on each side of the epitaxial semiconductor channel structure; a top source/drain structure extending outward from each sidewall of the third region of the epitaxial semiconductor channel material; and a sigma shaped source/drain extension region present between, and in contact with, the top faceted surface of the first region of the epitaxial semiconductor channel material and the bottom faceted surface of the second region of the epitaxial semiconductor channel material.