Patent ID: 11271091

Abstract:
A method for manufacturing a fin structure for a vertical field effect transistor (VFET) includes: forming on a substrate mandrels having at least one first gap therebetween; forming first spacers on side surfaces of the mandrels such that at least one second gap, smaller than the first gap, is formed between the first spacers; forming a second spacer on side surfaces of the first spacers; removing the mandrels and the first spacers to leave the second spacer on the side surfaces of the first spacers; removing the second spacer, on the side surfaces of the first spacers, at a predetermined portion so that the remaining second spacer has a same two-dimensional (2D) shape as the fin structure; and removing a portion of the substrate, except below the remaining second spacer, and the remaining second spacer so that the substrate below the remaining second spacer forms the fin structure.