Patent attributes
A method for forming a semiconductor device includes forming a semiconductor fin over a surface of a substrate and forming sacrificial spacers on first and second sides of the semiconductor fin. The first side opposes the second side. The method includes recessing the surface to expose second and third surfaces, recessing the second surface to form a first cavity between the sacrificial spacers and the substrate on the first side, and recessing the third surface to form a second cavity between the sacrificial spacers and the substrate on the second side. The method includes forming a first bottom spacer in the first cavity and forming a second bottom spacer in the second cavity. A thickness of the first bottom spacer in a direction between the sacrificial spacers and the substrate is substantially equal to a thickness of the second bottom spacer in the same direction.