Patent ID: 8178401

Claim:
A method comprising: providing a semiconductor substrate having a first area of a first conductivity type and a second area of a second conductivity type; forming a dielectric material on a surface of the substrate over the first area and over the second area; forming a sacrificial layer so that the dielectric material over the first area is exposed and dielectric material over the second area is protected by a remaining portion of the sacrificial layer; depositing a first gate conductor material over the exposed dielectric material and the remaining portion of the sacrificial layer; forming patterned photoresist over the first gate conductor material to cover a first portion of the first gate conductor material and expose a second portion of the first gate material over the remaining portion of the sacrificial layer; etching the second portion of the first gate conductor material to expose the remaining portion of the sacrificial layer ( 352 ) using a first etchant technique and stopping etching prior to etching through the remaining portion of the sacrificial layer so that the first etchant technique is precluded from attacking the dielectric material; removing the remaining portion of the sacrificial layer so as to expose the dielectric material over the second area using a second etchant technique, so that the remaining portion of the sacrificial layer is removed without comprising the dielectric layer; and depositing a second gate conductor material on the exposed dielectric material over the second area.