Patent ID: 11869956
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 23:
24. A method of fabricating an integrated circuit, the method comprising:
performing a first implant into a transistor region of a semiconductor substrate thereby producing an arsenic or antimony profile having a peak concentration at a first depth;
performing a second implant into the transistor region thereby producing a phosphorus profile having a peak concentration at a second depth greater than the first depth; and
performing a third implant into the transistor region thereby producing an argon profile having a peak concentration at a third depth greater than the first depth,
wherein the third implant is performed prior to formation of a gate over the transistor region,
the third implant is performed at an energy of between about 150 keV and about 600 keV with a dose of between about 1×1013 ions/cm2 and about 1×1014 ions/cm2, and
the third implant is performed in a four-rotation process at respective beam tilt angles of between about 0° from the vertical surface normal and about 10° from the vertical surface normal.