International Business Machines Corporation
Robust low-k bottom spacer for VFET

Abstract:

Embodiments of the present invention are directed to techniques for forming a robust low-k bottom spacer for a vertical field effect transistor (VFET) using a spacer first, shallow trench isolation last process integration. In a non-limiting embodiment of the invention, a semiconductor fin is formed over a substrate. A first dielectric liner is formed on a sidewall of the semiconductor fin. A bottom spacer is formed over the substrate and on a sidewall of the first dielectric liner. The first dielectric liner is positioned between the semiconductor fin and the bottom spacer. Portions of the bottom spacer are removed to define a shallow trench isolation region.