Patent ID: 8253190
Filing Date: 2012-08-28
Classification: H01L

Abstract:
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 silicon, oxygen and nitrogen, a distribution of nitrogen concentration having a first peak and a second peak in the tunnel insulating film, the first peak being close to the silicon substrate compared with the second peak, the first peak being higher than the second peak, a maximum of the first peak being in range of 20 atomic % to 47 atomic %, the first peak having a substrate-side tail where nitrogen concentration is 10 atomic % or less, and the substrate-side tail being included in the tunnel insulating film; a floating gate electrode formed on the tunnel insulating film; an inter-electrode insulating film formed on the floating gate electrode; and a control electrode formed on the inter-electrode insulating film.