Patent ID: 9190496
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method for fabricating a fin-type field-effect transistor (FinFET) device, the method comprising: receiving a precursor having a plurality of fins over a substrate and a dielectric layer filling in a space between each fin and extending above the fins; forming a patterned hard mask layer having an opening over the dielectric layer; etching the dielectric layer through the opening to form a trench with a vertical profile, wherein a subset of the fins is exposed in the trench; performing an isotropic dielectric etch to enlarge the trench in a horizontal direction, which is perpendicular to the vertical profile of the trench; performing an anisotropic etch to recess the subset of fins in the trench; and performing an isotropic fin etch to etch the recessed subset of fins.