Patent ID: 9059235
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate including a trench; a gate electrode disposed at a position adjacent to the trench on the substrate via a gate insulator, the gate electrode having a first side surface located on an opposite side of the trench, and a second side surface located on the same side as the trench, wherein a height of a lowermost surface of the gate electrode is higher than a height of an uppermost surface of the substrate at the position adjacent to the trench; a first sidewall insulator disposed on the first side surface of the gate electrode; a second sidewall insulator disposed on the second side surface of the gate electrode and a side surface of the trench, wherein a height of a bottom surface of the second sidewall insulator is lower than a height of a bottom surface of the first sidewall insulator; a source region of a first conductivity type disposed in the substrate, the source region being disposed on the same side as the first sidewall insulator with respect to the first side surface of the gate electrode; and a drain region of a second conductivity type disposed in the substrate, the drain region being disposed on the same side as the second sidewall insulator with respect to the second side surface of the gate electrode and the side surface of the trench.