Patent ID: 9583626
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor structure, said method comprising: forming a silicon germanium alloy portion on each sidewall surface of a silicon fin, said silicon fin extending upward from a remaining portion of a silicon substrate, wherein said forming said silicon germanium alloy portion comprises; providing a trench isolation dielectric material on exposed surfaces of said remaining portion of said silicon substrate and on exposed sidewall surfaces of each silicon germanium alloy portion and said silicon fin; and converting a portion of the silicon fin that is located laterally adjacent each silicon germanium alloy portion into a silicon germanium alloy fin, wherein said silicon germanium alloy fin comprises a wide upper portion and a narrower lower portion, wherein said silicon germanium alloy fin has a vertically graded germanium content in which said wide upper portion of said silicon germanium alloy fin has a greater germanium content than said narrower lower portion of said silicon germanium alloy fin and wherein sidewall surfaces of said narrower lower portion of said silicon germanium alloy fin are vertically coincident with sidewall surfaces of said silicon fin portion.