Patent ID: 6034398
Filing Date: 2000-03-07
Classification: H01L,Y10S

Abstract:
A semiconductor device comprising:a semiconductor substrate of a first conductivity type at a main surface side and a second conductive type at a back surface side;a groove portion formed in the main surface of said semiconductor substrate;a first insulating layer formed on the main surface of said substrate within said groove portion;a first electrode formed on said first insulating layer within said groove portion;a second insulating layer formed to cover said first electrode;a side wall insulating layer formed on a side wall of said second insulating layer;a first conductive region formed by implanting impurities of the second conductivity type in said semiconductor substrate from the main surface side;a second conductive region formed by implanting impurities of the first conductivity type in said first conductive region and having a depth shallower than that of said first conductive region and a higher concentration than a surface concentration of said first conductive region;a third conductive region formed by implanting impurities of the second conductivity type in a portion of said second conductive region and having a higher concentration than that of said second conductive region;a second electrode formed at the main surface side of said semiconductor substrate and being commonly in contact with said second and third conductive regions; anda third electrode formed on the back surface side of said semiconductor substrate.