Patent ID: 8343835
Filing Date: 2013-01-01
Classification: H01L

Abstract:
1. A method of producing a semiconductor device including a MOS transistor, comprising the steps of: providing a substrate on one side of which a plurality of semiconductor pillars stand; forming one of a first drain region and a source region in contact with a lower part of the respective semiconductor pillars; forming a first dielectric film to at least partially cover a sidewall of the respective semiconductor pillars; forming a conductive film on the first dielectric film; etching back the first dielectric film and the conductive film to leave the sidewall of the respective semiconductor pillars covered thereby along a height substantially equal to a gate length; partially removing by etching the remaining first dielectric film and the remaining conductive film to form a gate electrode formed around the respective semiconductor pillars and form a gate line extending from the gate electrode; forming, on a top surface of at least one of the semiconductor pillars, an epitaxial layer having a top surface larger in area than the top surface of the at least one of the semiconductor pillars; and forming the other of the source region and the drain region so as to be at least partially in the epitaxial layer of the at least one of the semiconductor pillars such that the other thereof has a substantially same conductivity type as that of the one thereof.