Patent ID: 9165935
Filing Date: 2015-10-20
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate including first trenches defining outer sidewalls of a pair of active pillars and a second trench defining opposing inner sidewalls of the pair of active pillars, the second trench having a bottom surface located at a higher level than bottom surfaces of the first trenches; auxiliary conductive lines disposed in respective ones of the first trenches to cover and cross the outer sidewalls of the pair of active pillars; a pair of main conductive lines, each disposed in one of a pair of recessed regions that are laterally recessed from lower portions of the inner sidewalls of the active pillars into the pair of active pillars, wherein top surfaces of the auxiliary conductive lines are disposed at a lower level than top surfaces of the main conductive lines; a common impurity region disposed between the main conductive lines and in the semiconductor substrate under the second trench; and upper impurity regions disposed in upper portions of the active pillars.