Patent ID: 8319279
Filing Date: 2012-11-27
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; a source region and a drain region, both of which are of a first conductivity type and arranged in the substrate; a channel region of a second conductivity type arranged, in the substrate, in a first direction between the source region and the drain region; a trench formed in the substrate between the source region and the drain region and having a side surface extending lengthwise in the first direction between the source region and the drain region; a gate insulating film formed in the trench; and a gate electrode formed in the trench through the gate insulating film such that a portion of the channel region extends sideward, in a second direction orthogonal to the first direction, from the lengthwise side surface of the trench is arranged between the source region and the drain region extending towards a next gate electrode, wherein the channel region at a bottom portion of the trench and at a surface of the substrate bounding the trench each have a higher dopant concentration of the second conductivity type than the portion of the channel region extending sideward in the second direction from the side surface of the trench.