Patent ID: 6744113
Filing Date: 2004-06-01
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate having a main surface and a trench, said trench having an entrance formed in said main surface; a doped insulator doped with impurities and disposed in said trench; an undoped insulator not being doped with impurities and disposed in said trench, said undoped insulator being positioned opposite to a bottom surface of said trench with said doped insulator interposed therebetween; a first oxynitride film disposed in said trench between said doped insulator and said semiconductor substrate and between said undoped insulator and said semiconductor substrate; and a second oxynitride film disposed between said doped insulator and said undoped insulator, wherein said doped insulator is isolated from said semiconductor substrate by said undoped insulator and said first oxynitride film.