Patent ID: 9105723
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: providing a semiconductor substrate comprising a first semiconductor surface and a second semiconductor surface, wherein said first semiconductor surface is vertically offset and located above said second semiconductor surface, and wherein a pair of spaced apart semiconductor mandrel structures is present on a portion of said first semiconductor surface of the semiconductor substrate; forming an oxide region on at least one of said first semiconductor surface and the second semiconductor surface; forming a first set of first semiconductor fins having a first height from one sidewall surface of each semiconductor mandrel structure and located above said first semiconductor surface, and forming a second set of second semiconductor fins having a second height from another sidewall surface of each semiconductor mandrel structure and located above the second semiconductor surface, wherein said second height is different than the first height, and wherein said first semiconductor fin and said second semiconductor fin each have a topmost surface and wherein said topmost surface of the first semiconductor fin is coplanar with the topmost surface of the second semiconductor fin; and removing each semiconductor mandrel structure from atop portions of the first semiconductor surface.