Patent ID: 6541395
Filing Date: 2003-04-01
Classification: H01L

Abstract:
A semiconductor processing method of forming field effect transistors comprising:forming a first gate dielectric layer over first and second areas of a semiconductor substrate, the first area being configured for forming p-type field effect transistors, the second area being configured for forming n-type field effect transistors; removing the first gate dielectric layer from over the second area and leaving the first gate dielectric layer over the first area; after the removing, forming a second gate dielectric layer over the second area; forming transistor gates over the first and second gate dielectric layers; forming p-type source/drain regions within the first area proximate the transistor gates in the first area and n-type source/drain regions within the second area proximate the transistor gates in the second area; and wherein the first gate dielectric layer comprises an oxide having nitrogen atoms therein, the nitrogen atoms being concentrated within the first gate dielectric layer at a location proximate an interface of the first gate dielectric layer with the semiconductor substrate, and the second gate dielectric layer comprises an oxide, the second gate dielectric layer oxide being substantially void of nitrogen atoms proximate an interface of the second gate dielectric layer with the semiconductor substrate.