Patent ID: 7588989

Claim:
A method for fabricating a semiconductor device comprising: forming a precursor layer including a metal oxide (MO y ) or metal oxynitride (MO y N z ), over a lower structure containing silicon; heat-treating the precursor layer to convert the precursor layer into a lower dielectric layer comprising amorphous silicate (M 1-x Si x O y ) or amorphous silicate nitride (M 1-x Si x O y N z ); forming an upper dielectric layer comprising amorphous metal oxide (M′O y ) or amorphous metal oxynitride (M′O y N z ), over the lower dielectric layer; and after forming the upper dielectric layer, heat-treating the lower dielectric layer and the upper dielectric layer to form a dielectric multilayer structure with reduced defects wherein the dielectric multilayer stricture includes the lower dielectric layer and upper dielectric layer, the lower dielectric layer including amorphous silicate (M 1-x Si x O y ) or amorphous silicate nitride (M 1-x Si x O y N z ), the upper dielectric layer including amorphous metal oxide (M′O y ) or amorphous metal oxynitride (M′O y N z ).