Patent ID: 7528442
Filing Date: 2009-05-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer of a first conduction type; a source region and a drain region of a second conduction type formed apart from each other by a specified interval at the surface portion of an element region sectioned by an element isolation film formed on the semiconductor layer; a gate electrode formed on a gate insulating film on the semiconductor layer between the source region and drain region; a channel stopper region of the first conduction type formed below the element isolation film; and at least one of the source region and drain region having a high concentration impurity region of the second conduction type and a low concentration impurity region of the second conduction type provided so as to surround the high concentration impurity region and to extend below the element isolation film; wherein the bottom of a portion of the low concentration impurity region below the element isolation film is positioned deeper than the bottom of a portion of the low concentration impurity region not covered by the element isolation film.