Patent ID: 8883597

Claim:
A method of fabricating a FinFET element comprising: providing a substrate including a first fin and a second fin; forming a first silica glass layer on the first fin, wherein the forming the first silica glass layer includes forming a plasma-enhanced phosphosilicate glass (pe-PSG) layer; forming an oxide layer on the pe-PSG layer and the second fin; providing a dopant of a second type performing a vapor phase diffusion process to diffuse the dopant of the second type into the oxide layer to form a doped layer; and after forming the pe-PSG layer and forming the doped layer, performing high temperature processing of the substrate, wherein the performing high temperature processing of the substrate provides for driving a dopant of the pe-PSG into the first fin and the dopant of the second type into the second fin by a solid phase diffusion process to form channels of transistor devices.