Patent ID: 8564060
Filing Date: 2013-10-22
Classification: H01L

Abstract:
1. A semiconductor device comprising: a low resistance first conducting type semiconductor substrate serving as a drain layer; a first main electrode connected to a backside of the semiconductor substrate; an epitaxial layer formed on the first conducting type semiconductor substrate and whose resistance is higher than the first conducting type semiconductor substrate; a second conducting type body region formed within the epitaxial layer; a plurality of source layer regions formed on the second conducting type body region, and with a low resistance approximately equal to the first conducting type semiconductor substrate; a body connecting layer formed in the epitaxial layer and connecting to the second conducting type body region, and whose resistance is lower than the second conducting type body region, a second main electrode formed on and in electrical contact with a first source layer region and a second source layer region of the plurality of source layer regions and the body connecting layer; trenches formed so as to penetrate through the second conducting type body region and the plurality of source layer regions; and a gate insulating film formed on bottom and side walls of each trench; a respective third main electrode formed within each trench and insulated by way of the gate insulating film from a sidewall portion of the respective source layer region and a sidewall of the body region adjacent to the trench, wherein a width of a first portion of the second conducting type body region between trenches that are adjacent in a first direction is greater than a width of a second portion of the second conducting type body region between trenches that are adjacent in a second direction perpendicular to the first direction, the first portion of the second conducting type body region has a higher dopant concentration than the second portion of the second conducting type body region, the body connecting layer is arranged between the first and second source layer regions in plan view and on the first portion of the body region, and the first portion of the second conducting type body region has a lower dopant concentration than the body connecting layer.