Patent ID: 9496260
Filing Date: 2016-11-15
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure, said method comprising: forming at least one silicon germanium alloy fin having a first germanium content within a first device region and within a second device region, wherein each silicon germanium alloy fin is located on a sacrificial material stack and wherein an oxide material is located on sidewall surfaces of each silicon germanium alloy fin; forming, in any order, a germanium layer atop each silicon germanium alloy fin within one of said device regions and a silicon germanium alloy layer having a second germanium content that is less than said first germanium content atop each silicon germanium alloy fin within another of said device regions not including said germanium layer; bonding an exposed surface of each of said germanium layer and said silicon germanium alloy layer to a base substrate; removing said sacrificial material stack; and recessing said oxide material to expose a portion of each silicon germanium alloy fin in said first and second device regions, wherein each silicon germanium alloy fin contacting said germanium layer is compressively strained, and each silicon germanium alloy fin contacting said silicon germanium alloy is tensely strained.