Patent ID: 7902035

Claim:
A method of forming fins for a semiconductor device, the method comprising: providing a substrate; forming one or more mask layers over the substrate; patterning the one or more mask layers to form a first set of adjacent trenches and a second set of adjacent trenches in the one or more mask layers, the first set of adjacent trenches having a first depth and the second set of adjacent trenches having a second depth, the second depth being different than the first depth; simultaneously transferring the pattern of the first set of adjacent trenches and the second set of adjacent trenches in the one or more mask layers into the substrate, thereby forming a third set of adjacent trenches and a fourth set of adjacent trenches corresponding to the first set of adjacent trenches and the second set of adjacent trenches, respectively; and forming a dielectric layer along a bottom of the first set of adjacent trenches and the second set of adjacent trenches, the dielectric layer along the bottom of the first set of adjacent trenches and the second set of adjacent trenches being substantially the same.