Patent ID: 8278694

Claim:
A semiconductor device including a plurality of vertical transistors, which comprises, on a substrate, a body portion of a pillar-shaped semiconductor; a gate electrode provided on the side surface of said body portion via a gate insulating film; a first diffusion layer connected to the bottom of said body portion; and a second diffusion layer connected to the top of said body portion, wherein said second diffusion layer includes a first portion formed within a region projected in the substrate vertical direction of the top surface of said body portion; and a second portion formed on the first portion and extended onto an interlayer insulating film, which is arranged between vertical transistors, outwards the region projected in the substrate vertical direction of the top surface of said body portion, wherein a second insulating film, which is different from the interlayer insulating film, is arranged on said interlayer insulating film between two adjacent vertical transistors, and wherein said second portion is an epitaxial growth layer formed by an isotropic selective epitaxial growth and is in contact with the side surface of said second insulating film.