Patent ID: 8519486
Filing Date: 2013-08-27
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate insulating film over a semiconductor substrate; a gate electrode over the gate insulating film; a channel region in the semiconductor substrate; and a source electrode and a drain electrode in the semiconductor substrate, wherein each of the source electrode and the drain electrode includes a first carbon doped silicon layer including carbon at a first carbon concentration and phosphorus at a first phosphorus concentration and a second carbon doped silicon layer over the first carbon doped silicon layer and in contact with the channel region, the second carbon doped silicon layer includes phosphorus at a second phosphorus concentration higher than the first phosphorus concentration and includes carbon at a second carbon concentration less than the first carbon concentration and, wherein a third carbon doped silicon layer is provided between the second carbon doped silicon layer and a sidewall spacer for the gate electrode and an upper surface of at least a portion of the third carbon doped silicon layer directly underlies the sidewall spacer.