Abstract: A method of forming a fin field effect transistor (finFET) device includes forming a silicon fin on a substrate; forming an inner spacer adjacent to a first portion of the silicon fin; forming silicon germanium regions adjacent to a second portion of the silicon fin and the inner spacer; and oxidizing the silicon germanium regions, such that the second portion of the silicon fin that is located adjacent to the silicon germanium regions is converted to a silicon germanium channel region during oxidizing of the silicon germanium regions, and such that the first portion of the silicon fin is protected by the inner spacer during oxidation of the silicon germanium regions, wherein the first portion of the silicon fin comprises a silicon buffer region located between the silicon germanium channel region and a source/drain region of the finFET device.

Abstract: A method of forming a silicon oxide, shallow trench isolation (STI) region, featuring a silicon rich, silicon oxide layer used to protect the STI region from a subsequent wet etch procedure, has been developed. The method features depositing a silicon oxide layer via PECVD procedures, without RF bias, using a high silane to oxygen ratio, resulting in a silicon rich, silicon oxide layer, located surrounding the STI region. The low etch rate of the silicon rich, silicon oxide layer, protect the silicon oxide STI region from buffered hydrofluoric wet etch procedures, used for removal of a dioxide pad layer.