Patent ID: 7674670
Filing Date: 2010-03-09
Classification: H01L

Abstract:
1. A method of forming threshold voltage implant regions, comprising: providing a monocrystalline silicon substrate, the substrate having at least two channel region locations defined therein, one of said at least two channel region locations being a first channel region location and another of the at least two channel region locations being a second channel region location; providing a mask which covers a second portion of the substrate and does not cover a first portion of the substrate; an entirety of the first channel region location being within the uncovered first portion; at least some of the second channel region location being within the covered second portion, said at least some of the second channel region location being a covered section of the second channel region location; implanting threshold voltage dopant into the uncovered first portion of the substrate; and diffusing the implanted threshold voltage dopant throughout 80% or more of the area of the covered section of the second channel region location.