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Enhanced boron activation in silicon by high ramp-up rate solid phase epitaxial regrowth

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6 Author(s)
Pawlak, B.J. ; Philips Research Leuven, Kapeldreef 75, 3001 Leuven, Belgium ; Vandervorst, W. ; Smith, A.J. ; Cowern, N.E.B.
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We investigate the influence of thermal conditions during solid phase epitaxial regrowth (SPER) on the electrical activation level of boron in preamorphized silicon, both with respect to heating ramp rates and the use of low temperature preanneals. Enhancement of electrically active boron concentration by 36% is observed for activation with the fastest ramp rate (487 °C/s) compared to the slowest one (1 °C/s). An important clustering pathway occurs within the amorphous silicon phase (during low temperature preanneal) prior to completion of the SPER process. In these junctions boron deactivation during isochronal post-annealing is almost independent on the maximum boron activation level.

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Applied Physics Letters  (Volume:86 ,  Issue: 10 )