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Published online by Cambridge University Press: 21 February 2011
Chemical doping of single-crystal silicon in a PF5 atmosphere is performed byirradiation with an ArF excimer laser working at 193 nm. We have investigated the dependence of doping parameters such as the number of pulses and PF5 gas pressure on the sheet resistance and the impurity concentration profiles. From these results, it is found that phosphorus atoms are produced by pyrolysis of PF5 molecules adsorbed (chemisorbed at low pressure and physisorbed at pressure higher than 1 Torr) on thesilicon surface. As for the incorporation mechanism, it is shown that the process is external rate limited for doping in PF5 ambient whereas mainly diffusion limitedfor doping using only the chemisorbed layer.