Semiconductor device and method for manufacturing the same
View Patent ↗It is made possible to provide a method for manufacturing a semiconductor device that has a high-quality insulating film in which defects are not easily formed, and experiences less leakage current. A method for manufacturing a semiconductor device, includes: forming an amorphous silicon layer on an insulating layer; introducing oxygen into the amorphous silicon layer; and forming a silicon oxynitride layer by nitriding the amorphous silicon layer having oxygen introduced thereinto.
1. A semiconductor device, comprising:
source and drain regions formed at a distance from each other in a silicon substrate;
a tunnel insulating film formed on the silicon substrate located between the source region and the drain region, the tunnel insulating film including a first silicon oxynitride layer formed on the silicon substrate and having average nitrogen concentration higher than 0 atomic % but not higher than 10 atomic %, a second silicon oxynitride layer formed on the first silicon oxynitride layer and having average oxygen concentration in the range of 10 atomic % to 30 atomic %, and a silicon oxide layer formed on the second silicon oxynitride layer;
a floating gate electrode formed on the tunnel insulating film;
an interelectrode insulating film formed on the floating gate electrode; and
a control electrode formed on the interelectrode insulating film.
2. The device according to claim 1 , wherein the second silicon oxynitride layer has average nitrogen concentration in the range of 20 atomic % to 47 atomic %.
3. The device according to claim 2 , wherein the first silicon oxynitride layer contains Ge.
4. A semiconductor device, comprising:
source and drain regions formed at a distance from each other in a silicon substrate;
a tunnel insulating film formed on the silicon substrate located between the source region and the drain region, the tunnel insulating film including a first silicon oxynitride layer formed on the silicon substrate and having average nitrogen concentration higher than 0 atomic % but not higher than 10 atomic %, a second silicon oxynitride layer formed on the first silicon oxynitride layer and having average oxygen concentration in the range of 10 atomic % to 30 atomic %, and silicon oxide layer formed on the second silicon oxynitride layer;
a charge storage film formed on the tunnel insulating film;
an interelectrode insulating film formed on the charge storage film; and
a control electrode formed on the interelectrode insulating film.
5. The device according to claim 4 , wherein the second silicon oxynitride layer has average nitrogen concentration in the range of 20 atomic % to 47 atomic %.
6. The device according to claim 5 , wherein the first silicon oxynitride layer contains Ge.
7. A semiconductor device comprising:
a silicon region;
a tunnel insulating film formed on the silicon region, the tunnel insulating film including a first silicon oxynitride layer formed on the silicon region and having average nitrogen concentration higher than 0 atomic % but not higher than 10 atomic %, a second silicon oxynitride layer formed on the first silicon oxynitride layer and having average oxygen concentration in the range of 10 atomic % to 30 atomic %, and a silicon oxide layer formed on the second silicon oxynitride layer;
a charge storage film formed on the tunnel insulating film;
an interelectrode insulating film formed on the charge storage film; and
a control electrode formed on the interelectrode insulating film.
8. The device according to claim 7 , wherein the second silicon oxynitride layer has average nitrogen concentration in the range of 20 atomic % to 47 atomic %.
9. The device according to claim 8 , wherein the first silicon oxynitride layer contains Ge.