Patent ID: 8896067
Filing Date: 2014-11-25
Classification: H01L

Abstract:
1. A method comprising: forming a first and a second group of fins on a substrate; covering a top first portion of said first and second groups of fins with a first dielectric material by forming spacers of said first dielectric material directly next to sidewalls of said top first portion of said first and second groups of fins; covering a bottom second portion of said first and second groups of fins with a second dielectric material, said second dielectric material being uniformly recessed to cause said bottom second portion of said first group of fins having a same height as said bottom second portion of said second group of fins; exposing a middle third portion of said first and second groups of fins to an oxidizing environment to create an oxide section that separates said top first portion from said bottom second portion of said first and second groups of fins; and forming one or more fin-type field-effect-transistors (FinFETs) using said top first portion of said first and second groups of fins as fins under gates of said one or more FinFETs.