Patent ID: 6229194
Filing Date: 2001-05-08
Classification: H01L,Y10S

Abstract:
A semiconductor device formed in a silicon substrate of one conductivity type, said device comprising:a trench formed in said silicon substrate which separates and surrounds each of at least two cells formed in said substrate and which extends from a top surface of said substrate to a bottom surface of said substrate;a first insulating layer formed only on a lower portion of the walls of said trench structured and arranged so that an upper portion of the walls of said trench remain free of said first insulating layer;a region of polysilicon formed in said trench and extending from said top surface to said bottom surface of said substrate between said layer of insulating material, thereby filling said trenches;a region of another conductivity type, which is of opposite conductivity type to said one conductivity type, formed in said top surface of said silicon substrate;a region of impurities of said one conductivity type formed in said top surface of said substrate and being spaced from and surrounding said region of said another conductivity type;an overlaying insulation layer formed atop said top surface of said silicon substrate and having at least one opening to said region of said one conductivity type in a respective one of said cells and at least one opening to said region of another conductivity type in another, adjoining one of said cells; anda conductive layer comprising at least one interconnecting contact which connects said region of said one conductivity type of said respective cell and said region of said other conductivity type of said adjoining cell.