Patent ID: 7863119
Filing Date: 2011-01-04
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a first silicon oxide layer on a silicon substrate; forming a first silicon oxynitride layer by nitriding the first silicon oxide layer; forming an amorphous silicon layer on the first silicon oxynitride layer; introducing oxygen into the amorphous silicon layer; forming a second silicon oxynitride layer by nitriding the amorphous silicon layer having oxygen introduced thereinto; and forming a second silicon oxide layer on the second silicon oxynitride layer, thereby forming a three-layer structure including the first silicon oxynitride layer having an average nitrogen concentration higher than 0 atomic % but not higher than 10 atomic %, the second silicon oxynitride layer having an average oxygen concentration in the range of 10 atomic % to 30 atomic %, and the second silicon oxide layer.