Patent ID: 6962728
Filing Date: 2005-11-08
Classification: H01L

Abstract:
1. A method for making a silicon oxide/silicon nitride/silicon oxide structure comprises: forming a first silicon oxide layer over a substrate and forming a silicon nitride layer over the first oxide layer by chemical vapor deposition; forming a second silicon oxide layer over the silicon nitride layer by high temperature low pressure chemical vapor deposition, the first silicon oxide layer and the silicon nitride layer and the second silicon oxide layer constituting a silicon oxide/silicon nitride/silicon oxide film; performing a wet oxidation; depositing a first gate layer over the second silicon oxide layer; patterning the gate layer and the silicon oxide/silicon nitride/silicon oxide film to form a silicon oxide/silicon nitride/silicon oxide structure; forming bit lines in the substrate adjacent the silicon oxide/silicon nitride/silicon oxide structure; and annealing to form a thermal oxide over the bit lines.