Oct 28, 2015

Damage formation and recovery in Fe implanted 6H–SiC

Silicon carbide doped with magnetic ions such as Fe, Mn, Ni or Co could make this wide band gap semiconductor part of the diluted magnetic semiconductor family. In this study, we report the implantation of 6H–SiC single crystals with magnetic 56Fe+ ions with an energy of 150 keV. The samples were implanted with 5 × 1014 Fe+/cm2 and 1 × 1016 Fe+/cm2 at different temperatures to study the damage formation and lattice site location. The samples were subsequently annealed up to 1500 °C in vacuum in order to remove the implantation damage. The effect of the annealing was followed by Rutherford Backscattering/Channeling (RBS/C) measurements. The results show that samples implanted above the critical amorphization temperature reveal a high fraction of Fe incorporated into regular sites along the 〈0 0 0 1〉 axis. After the annealing at 1000 °C, a maximum fraction of 75%, corresponding to a total of 3.8 × 1014 Fe+/cm2, was measured in regular sites along the 〈0 0 0 1〉 axis.
A comparison is made between the observed annealing behavior and the one measured in low fluence (2 × 1013 cm−2) β emission channeling experiments using the radioactive isotope 59Fe (t1/2 = 45 d), where the sample was implanted at room temperature and the β emission channeling yield was measured by means of a position-sensitive detector.

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