Patent ID: 7145202
Filing Date: 2006-12-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate including a main surface; a source region and a drain region formed on the main surface of the semiconductor substrate and spaced from each other by a predetermined interval; a gate electrode formed on the semiconductor substrate; a trench filled with insulation material and formed with a predetermined depth in the main surface of the semiconductor substrate between a location under the gate electrode and at least one of the source region and the drain region, wherein the trench extends under at least one of the source region and the drain region, wherein the trench has opposite side wall surfaces and a bottom surface; and an LDD formed along the trench and having an impurity concentration that is lower than that of the source region and the drain region, wherein the LDD extends along the opposite side wall surfaces and the bottom surface of the trench.