Patent ID: 7718498
Filing Date: 2010-05-18
Classification: H01L,H04N,Y10S

Abstract:
1. A semiconductor device comprising: a gate electrode formed over a semiconductor substrate; a first conductivity type region formed in the semiconductor substrate under a conductive portion of the gate electrode and containing a first conductivity type impurity; first source/drain regions of the first conductivity type impurity formed in the semiconductor substrate, the first source/drain regions being formed from a first ion implantation having a first implantation energy and a first dosage amount; and second source/drain regions having a first conductivity type impurity concentration lower than that in the first source/drain regions and formed extending from beneath the gate electrode in the semiconductor substrate, the second source/drain regions being formed from a second ion implantation having a second implantation energy substantially greater than the first implantation energy and a second dosage amount substantially less than the first dosage amount.