Implementation of molecular ion implant technology for PMOS extension implants and their compatibility with DRAM process flows
2008
Molecular B and molecular C have been implanted in PMOS devices at the source drain extension (SDE) level. Different implant sequences have been compared in which Bi 8 H 22 and C 16 H 10 have been combined with pre-amorphization and co-implants. Bi 8 H 22 shows very good Vt roll-off behaviour and low junction leakage. Molecular C stabilizes junctions in post-processing DRAM annealing. Both molecular species show the potential to combine the beneficial effects of a pre-amorphization implant followed by a C and B implant in the formation of ultra-shallow junctions.
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