Patent ID: 8026142
Filing Date: 2011-09-27
Classification: H01L

Abstract:
1. A method of fabricating semiconductor devices, the method comprising: fabricating a device structure comprising a semiconductor material and a plurality of gate structures formed overlying the semiconductor material; creating light dose extension implants in the semiconductor material, using the plurality of gate structures as a first implantation mask, by bombarding the device structure with ions at a non-tilted angle relative to an exposed surface of the semiconductor material; forming a patterned mask overlying the semiconductor material, the patterned mask being arranged to protect shared drain regions of the semiconductor material and to leave shared source regions of the semiconductor material substantially exposed; producing heavy dose extension implants in the semiconductor material, using the plurality of gate structures and the patterned mask together as a second implantation mask, by bombarding the device structure with ions at a tilted angle relative to the exposed surface of the semiconductor material, and toward the plurality of gate structures; and forming halo implants in the semiconductor material, using the second implantation mask, by bombarding the device structure with ions at a second tilted angle relative to the exposed surface of the semiconductor material, and toward the plurality of gate structures.