Patent ID: 9425099
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. A method, comprising: forming a plurality of first gate structures over a substrate, wherein the plurality of first gate structures have a vertical dimension (h) and are separated by a first horizontal space (s forming a plurality of second gate structures on the substrate, wherein the plurality of second gate structures have the vertical dimension (h) and are separated by a second horizontal space (s performing a first implant at a first angle with a vertical line to form halo regions within the substrate, wherein the halo regions extend below the plurality of first gate structures and the plurality of second gate structures; and performing a second implant after the first implant and at a second angle with the vertical line to introduce dopant impurities into the substrate that reduce a doping concentration of the halo regions that extend below the plurality of second structures, wherein the second angle is greater than the first angle such that the second implant is blocked from reaching the substrate by the plurality of first gate structures.