Influence of annealing sequence on p(+)/n junction images studied by scanning capacitance microscopy

Abstract

We have successfully employed scanning capacitance microscopy (SCM) operated under low photoperturbation to investigate electrical junction profiles in low-energy BF2+-implanted silicon wafers treated by various annealing sequences. Differential capacitance images reveal that rapid thermal annealing (RTA) followed by furnace annealing (FA) treatments (RTA+FA) can result in a narrower junction width and a shallower electrical junction depth than FA followed by RTA treatments (FA+RTA). Experimental results also indicate that the wider junction of the FA+RTA treated sample is due to the shallower concentrated distribution of electrically activated boron atoms upon annealing. Subtle correlations between electrical junctions and annealing conditions are discussed. (C) 2004 The Electrochemical Society.