Patent ID: 9293375
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure, said method comprising: providing a trench isolation structure in a semiconductor substrate; forming a mandrel structure having a first portion located above said semiconductor substrate and a second portion located above said trench isolation structure, wherein a bottommost surface of said mandrel structure straddles a sidewall edge of said trench isolation structure; forming a nitride spacer on each sidewall of said mandrel structure; removing said mandrel structure selective to said nitride spacers; forming a dielectric oxide material having a topmost surface that is coplanar with a topmost surface of said nitride spacers; removing one of nitride spacers to provide a cavity exposing a portion of a topmost surface of said semiconductor substrate and another of said nitride spacers to provide another cavity exposing a portion of a topmost surface of said trench isolation structure; and epitaxially growing a semiconductor fin in said cavity that exposes said portion of said topmost surface of said semiconductor substrate, but not in said another cavity that exposes said portion of said topmost surface of said trench isolation structure, wherein a bottommost surface of said semiconductor fin directly contacts an exposed portion of said topmost surface of said semiconductor substrate.