Patent ID: 9190498
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method of forming spacers on side surfaces of a gate on a finFET, where said finFET comprises a fin structure and said gate is disposed on said fin structure, comprising: depositing a dielectric material on said finFET, wherein said dielectric material covers a top surface and side surfaces of said gate and covers a top surface and side surfaces of said fin structure; implanting ions of a first species into said dielectric material disposed on said side surfaces of said fin structure, such that ions of the first species are not implanted into the dielectric material disposed on the top surface of said gate and the dielectric material disposed on the top surface of said fin structure, said first species increasing an etch rate of said material; and performing an anisotropic etching process on said finFET after said implanting, wherein said anisotropic etch preferentially removes dielectric material from the horizontal surfaces of said fin structure and said gate, so that said dielectric material is removed from said top surface of said gate and said top surface and side surfaces of said fin and remains on said side surfaces of said gate.