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Analysis of ion beam induced damage and amorphization of 6H-SiC by raman scattering

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Abstract

Raman scattering analysis of damaged SiC layers obtained by 200 keV Ge+ ion implantation into 6H-SiC has been performed as a function of the implanted dose (up to 1015 cm−2) and annealing temperature (up to 1500°C). The results obtained show the presence of three different damage levels: low damage level (doses ≤3 × 1012 cm−2), medium to high damage level (doses between 1013 and 1014 cm-2), and formation of a continuous amorphous layer for doses higher than the amorphization threshold of 2–3 × 1014 cm−2.

Moreover, at doses of about 1014 cm−2 (below the amorphization threshold) amorphous domains are already observed. The Raman spectra indicate the existence of structural differences between the amorphous phase at doses below and above the threshold. After annealing, there is a residual damage which cannot be removed even at the highest annealing temperature of 1500°C. Differences in residual damage between the samples implanted at doses of 1014 and 1015 cm-2 and annealed at the highest temperatures are observed from the peaks in the 1000–1850 cm-1 spectral region. Finally, annealing at the highest temperature is required to observe the complete disappearance of the amorphous bands.

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Pérez-Rodríguez, A., Pacaud, Y., Calvo-Barrio, L. et al. Analysis of ion beam induced damage and amorphization of 6H-SiC by raman scattering. J. Electron. Mater. 25, 541–547 (1996). https://doi.org/10.1007/BF02666633

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