Provided is a method for forming a semiconductor structure. In embodiments of the invention, the method includes forming a semiconductor fin on a source/drain region, forming a liner including a first dielectric material along sidewalls of the semiconductor fin and along sidewalls of the source/drain region, forming a second dielectric material along sidewalls of the liner including the first dielectric material, and removing the liner including the first dielectric material from sidewalls of the semiconductor fin. Removing the liner including the first dielectric material includes exposing portions of the source/drain region. The method further includes forming a spacer layer on the second dielectric material and portions of the source/drain region exposed by removing the liner including the first dielectric material and forming a gate material on the spacer layer.