The abstract of the patent published by the U.S. Patent and Trademark Office states: "A process is disclosed which incorporates implantation of a carbon cluster into a substrate to improve the characteristics of transistor junctions when the substrates are doped with Boron and Phosphorous in the manufacturing of PMOS transistor structures in integrated circuits. There are two processes which result from this novel approach: (1) diffusion control for USJ formation; and (2) high dose carbon implantation for stress engineering. Diffusion control for USJ formation is demonstrated in conjunction with a boron or shallow boron cluster implant of the source/drain structures in PMOS. More particularly, first, a cluster carbon ion, such as C.sub.16H.sub.x.sup.+, is implanted into the source/drain region at approximately the same dose as the subsequent boron implant; followed by a shallow boron, boron cluster, phosphorous or phosphorous cluster ion implant to form the source/drain extensions, preferably using a borohydride cluster, such as B.sub.18H.sub.x.sup.+ or B.sub.10H.sub.x.sup.+. Upon subsequent annealing and activation, the boron diffusion is reduced, due to the gettering of interstitial defects by the carbon atoms."
The patent application was filed on
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