Patent ID: 7456474
Filing Date: 2008-11-25
Classification: H01L

Abstract:
1. A semiconductor device including at least one thin film transistor formed over a substrate, said semiconductor device comprising: a first silicon oxynitride film (A) formed on said substrate; a second silicon oxynitride film (B) formed on said silicon oxynitride film (A); a semiconductor layer formed on the silicon oxynitride film (B); and a gate electrode comprising at least a first layer of tantalum nitride and a second layer of tungsten formed on the first layer, wherein a composition ratio of nitrogen, with respect to oxygen, in the silicon oxynitride film (A) is more than or equal to 0.6, and is less than or equal to 1.5; and a composition ratio of nitrogen, with respect to oxygen, in the silicon oxynitride film (B) is more than or equal to 0.01, and is less than or equal to 0.4.