Correlation between implantation defects and dopants in Fe-implanted SiC

Abstract : SiC single crystals were implanted with Fe ions and the effects of implantation temperature, Fe concentration, and subsequent swift heavy ion irradiation on both dopant and damage depth distributions were evaluated by using RBS and channelling techniques. It is found that an increase of the implantation temperature above the threshold temperature for amorphization can lead to the formation of a broad layer (similar to 50 nm) containing a large concentration of implanted Fe atoms (similar to 2 at.%) but almost free of implantation defects. This particular configuration is likely due to dynamic annealing during implantation combined with defect annihilation at the surface. It is only observed when the implanted species concentration does not exceed a critical value (which lies between 2 and 5 at.% in the present system). Post-implantation swift heavy ion irradiation leads to a further decrease of the damage level, while the Fe distribution is not affected. The Fe substitutional fraction has been evaluated in the different tested conditions. A maximum value of similar to 50% is found when implantation is performed at the temperature above that required to prevent amorphization (470 K in the present system). Swift-heavy ion irradiation seems to induce Fe atoms relocation at substitutional positions.
Type de document :
Article dans une revue
Applied Physics A, Springer Verlag, 2012, 106, pp.679-685. <10.1007/s00339-011-6660-1>


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Soumis le : lundi 26 mars 2012 - 12:20:00
Dernière modification le : mercredi 2 décembre 2015 - 11:07:37

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A. Declemy, A. Debelle, C. Dupeyrat, L. Thome, I. Monnet, et al.. Correlation between implantation defects and dopants in Fe-implanted SiC. Applied Physics A, Springer Verlag, 2012, 106, pp.679-685. <10.1007/s00339-011-6660-1>. <in2p3-00682552>

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