Patent ID: 9331073
Filing Date: 2016-05-03
CPC Classification: H01L

Claim Text:
1. A method comprising: forming a pad layer on a {100} crystallographic oriented substrate; forming a mandrel on the pad layer, wherein the pad layer is an oxide layer on a nitride layer; forming spacers on sidewalls of the mandrel, wherein the spacers are silicon nitride; forming a spacer pattern by removing the mandrel from in-between the spacers; transferring the spacer pattern into the oxide layer using the nitride layer as an etch stop; transferring the spacer pattern into the nitride layer and simultaneously removing the spacers from above the oxide layer; forming fins in the substrate by transferring the spacer pattern in the nitride layer into the substrate; forming a recessed oxide fill on the substrate and in-between the fins, a top surface of the recessed oxide fill is below a top surface of the fins; forming a conformal well on the fins using epitaxial growth; and forming a conformal barrier on the conformal well using epitaxial growth, wherein the conformal well is in-between the fins and the conformal barrier, the conformal well has a lower band-gap than the conformal barrier and the fins; wherein the oxide layer is undoped silicon glass; and wherein the nitride layer is silicon nitride.