Patent ID: 8969943
Filing Date: 2015-03-03
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate; a first gate electrode disposed over the semiconductor substrate; a second gate electrode disposed over the semiconductor substrate so as to be adjacent to the first gate electrode; a first insulating film formed between the first gate electrode and the semiconductor substrate; and a second insulating film formed between the second gate electrode and the semiconductor substrate, and between the first gate electrode and the second gate electrode, said second insulating film including therein a charge storing portion, wherein the second gate electrode includes: a first silicon region positioned over the second insulating film; and a second silicon region positioned over the first silicon region, wherein the second silicon region contains p-type impurities, wherein a concentration of p-type impurities of the first silicon region is lower than that of the p-type impurities of the second silicon region, wherein the second insulating film and the first silicon region of the second gate electrode intervene in between the semiconductor substrate and the second silicon region of the second gate electrode, and wherein the second insulating film and the first silicon region of the second gate electrode intervene in between the first gate electrode and the second silicon region of the second gate electrode.