Patent ID: 6566204
Filing Date: 2003-05-20
Classification: H01L

Abstract:
A method comprising the steps of:furnishing a gate electrode generally above, and vertically separated by gate dielectric material from, an intended channel-zone location in a semiconductor body along its upper surface; providing a mask over the semiconductor body and the gate electrode such that the mask has a mask opening which at least partially overlies the gate electrode and which defines opposite first and second transverse mask sides located laterally beyond the gate electrode and any material situated on opposite transverse sides of the gate electrode; performing one of (a) directing first ions of a species of a primary semiconductor dopant toward the mask and mask opening at a first average tilt angle of at least 15Â° along paths that originate laterally beyond the first transverse mask side such that an electrically significant amount of the first ions passes through the mask opening and enters the channel-zone location and (b) directing second ions of the species of the primary dopant toward the mask and mask opening at a second average tilt angle of at least 15Â° along paths that originate laterally beyond the second transverse mask side such that the mask, the gate electrode, and any material along the gate electrode substantially block any electrically significant amount of the second ions from entering the channel-zone location, the tilt angles being measured from a perpendicular to a plane extending generally along the body's upper surface; and performing the other of the directing steps.