Patent ID: 9219154
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: providing a semiconductor-containing fin structure on a surface of a base layer, wherein said semiconductor-containing fin structure comprises, from bottom to top, and in an alternating manner, at least one first semiconductor material portion having a first oxidation rate, and at least one second semiconductor material portion having a second oxidation rate, wherein said first oxidation rate is slower than the second oxidation rate; performing an oxidation process to form a continuous oxide liner on semiconductor sidewall surfaces of said semiconductor-containing fin structure, wherein said continuous oxide liner comprises a first oxide liner portion having a first thickness and located on each of said first semiconductor material portions and a second oxide liner portion having a second thickness that is greater than the first thickness and located on each of said second semiconductor material portions; completely removing said first oxide liner portion from each of said first semiconductor material portions, while partially removing said second oxide liner portion from each of said second semiconductor material portions; and epitaxially growing a semiconductor material protruding portion from an exposed semiconductor sidewall surface of each of said first semiconductor material portions.