Patent ID: 6262456
Filing Date: 2001-07-17
Classification: H01L

Abstract:
An integrated circuit including at least one million field effect transistors, the transistors including a first group of the transistors having a first threshold voltage and a second group of the transistors having a second threshold voltage, the first threshold voltage being different than the second threshold voltage, the transistors having a doped semiconductor gate material comprised of a first semiconductor material provided with a second semiconductor material, wherein the doped semiconductor gate material of the first group of the transistors has a first concentration of the second semiconductor material, wherein the doped semiconductor gate material of the second group of the transistors has a second concentration of the second semiconductor material, the first concentration being different than the second concentration, whereby a difference between the first threshold voltage and the second threshold voltage is related to a difference between the first concentration and the second concentration, wherein the transistors each include a pair of dielectric spacers, the dielectric spacers being covered by a silicon oxynitride layer, wherein the silicon oxynitride layer is exlusive of a top surface of the doped semiconductor gate material.